Discordian date: Difference between revisions

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Task

Convert a given date from the Gregorian calendar to the Discordian calendar.

8080 Assembly

This program is written to run under CP/M, and it takes a Gregorian date as an argument on the command line, in DDMMYYYY format.

<lang 8080asm> ;; On the 44th day of Discord in the YOLD 3186, ddate ;; has finally come to CP/M. bdos: equ 5 ; CP/M syscalls puts: equ 9 putch: equ 2 fcb: equ 5ch month: equ fcb + 1 ; use the FCB as the date argument day: equ month + 2 year: equ day + 2 org 100h ;; CP/M will try to parse the command line arguments as if ;; they are filenames. As luck would have it, MMDDYYYY is ;; 8 characters. It would be a shame not to use this. lxi h,month ; check that the 'filename' is lxi b,0800h ; all digits (and zero out C) argcheck: mov a,m call isdigit jnc argerror ; if not, give an error and exit inx h dcr b jnz argcheck ;; Fix the year (add 1166 to it, digit by digit) lxi d,year + 3 lxi h,yearoffset + 3 mvi b,4 ana a ; Clear carry yeardgt: ldax d ; Get digit adc m ; Add offset digit cpi '9' + 1 ; Did we overshoot? cmc ; Carry is opposite of what we need jnc yearnextdgt ; No carry = no adjustment sui 10 ; Compensate stc ; Carry the one yearnextdgt: stax d ; Save digit dcx d ; Look at more significant digit dcx h dcr b ; Until we're out of digits jnz yeardgt lxi h,year + 4 ; Terminate the year with a $ mvi m,'$' ; for easy output. ;; Is it St. Tib's Day? lxi d,month ; Check month and day lxi h,leap ; Against '0229' mvi b,4 tibcheck: ldax d ; Get date byte cmp m ; Match against leap day jnz notibs ; No match = not Tibs inx h inx d dcr b jnz tibcheck ; if they all match it _is_ Tibs ;; Print "St. Tib's Day in the YOLD NNNN." lxi d,tibsday call outs ; fall through into printyear ;; Print " in the YOLD NNNN." printyear: lxi d,yold call outs lxi d,year jmp outs ; if Tibs, this ends the program ;; It isn't St. Tib's Day. We'll need to do real work :( notibs: lxi h,month ; Find days at beginning of month call parsenum ; (not counting Tibs) dcr a ; subtract one (table is 0-indexed) cpi 12 ; check that month < 12 jnc argerror ; otherwise, argument error ana a ; multiply month by 2 ral ; (entries are 2 bytes wide) lxi h,monthdays ; get days table mov d,c ; look up the entry (C is zero here) mov e,a dad d mov e,m ; load the 16-bit entry into DE inx h mov d,m lxi h,day ; Find day number call parsenum mov l,a ; Add it to the start of the month mov h,c ; (C is still zero) - to get the day dad d ; number (still not counting Tibs) dcx h ; One less (so we have day numbering at 0) push h ; Keep day number lxi d,-365 ; Make sure it isn't >365 dad d jc argerror ; Give an error otherwise pop h ; Restore day number push h ; Keep it around ;; Calculate Erisian weekday lxi d,-5 ; It's not worth it being clever here weekcalc: dad d jc weekcalc lxi d,5 dad d mov b,l lxi h,weekdays ; Print the day of the week call strselect lxi d,commaday ; Print ", day " call outs ;; Calculate season and season day number pop h ; Restore day number mvi b,-1 ; B will be season lxi d,-73 ; L will be day seasoncalc: inr b ; One season further on dad d ; Is 73 days less jc seasoncalc lxi d,73 ; Correct overshoot dad d mov h,b ; H:L = season:day inr l ; One based for output push h ; Push season and day mov a,l ; Print day of season mvi c,'0'-1 ; Tens digit in C seasondgts: inr c sui 10 jnc seasondgts adi '0' + 10 ; Ones digit in A mov e,c ; Tens digit call oute mov e,a ; Ones digit call oute lxi d,of ; Print " of " call outs pop b ; Retrieve season:day push b lxi h,seasons ; Print the season name call strselect call printyear ; "... in the YOLD NNNN ..." ;; Is there any reason to celebrate? (day=5 or day=50) pop b ; Retrieve season:day mov a,c ; Day. cpi 5 ; is it 5? jz party ; Then we party cpi 50 ; otherwise, is it 50? rnz ; If not, we're done party: push b ; Keep day lxi d,celebrate ; "... Celebrate ..." call outs pop b ; Retrieve day push b lxi h,holydays5 ; Get holyday from 5 or 50 table mov a,c cpi 50 jnz dayname lxi h,holydays50 dayname: call strselect ; the season is still in B lxi d,xday pop b ; Retrieve day once more mov a,c cpi 50 jnz outs ; Print 'day' or 'flux' depending lxi d,xflux jmp outs ;; Parse the 2-digit number in HL. Return in B (and A) parsenum: mvi b,0 ; zero accumulator call parsedigit ; this runs it twice parsedigit: mov a,b ; B *= 10 add a mov b,a add a add a add b add m ; Add the digit sui '0' ; Subtract '0' mov b,a inx h ret ;; Print the B'th string from HL strselect: mvi a,'$' strsearcho: dcr b jm strfound strsearchi: cmp m inx h jnz strsearchi jmp strsearcho strfound: xchg jmp outs ;; Print the argument error, and exit argerror: lxi d,argfmt ;; Print the string in DE and exit error: call outs rst 0 ;; Returns with carry flag set if A is a digit ('0'-'9'). isdigit: cpi '0' cmc rnc cpi '9' + 1 ret ;; Print the string in D. outs: mvi c,puts jmp bdos ;; Print character in E, keeping registers. oute: push psw push b push d push h mvi c,putch call bdos pop h pop d pop b pop psw ret ;; Accumulated days at start of Gregorian months ;; (in a non-leap year) monthdays: dw 0,31,59,90,120,151,181,212,243,273,304,334 ;; Difference between Gregorian and Erisian year count ;; (we don't need to bother with the year otherwise) yearoffset: db 1,1,6,6 ;; This is matched to MMDD to handle St. Tib's Day leap: db '0229' ;; Strings argfmt: db 'DDATE MMDDYYYY$' weekdays: db 'Sweetmorn$Boomtime$Pungenday$Prickle-Prickle$' db 'Setting Orange$' commaday: db ', day $' of: db ' of $' seasons: db 'Chaos$Discord$Confusion$Bureaucracy$The Aftermath$' celebrate: db ': celebrate $' holydays5: db 'Mung$Mojo$Sya$Zara$Mala$' xday: db 'day!$' holydays50: db 'Chao$Disco$Confu$Bure$Af$' xflux: db 'flux!$' tibsday: db 'Saint Tib',39,'s Day$' yold: db ' in the YOLD $' </lang>

Output:

A>ddate 04272020
Boomtime, day 44 of Discord in the YOLD 3186
A>ddate 09261995
Prickle-Prickle, day 50 of Bureaucracy in the YOLD 3161: celebrate Bureflux!
A>ddate 02291996
Saint Tib's Day in the YOLD 3162
A>ddate 07222011
Pungenday, day 57 of Confusion in the YOLD 3177
A>ddate 01052005
Setting Orange, day 05 of Chaos in the YOLD 3171: celebrate Mungday!

8086 Assembly

Translation of: 8080 Assembly

This program runs under DOS. It can take a date on the command line in the form MM/DD/YYYY, and if a date is not given, it asks DOS for the system date and uses that instead. It is mostly a port of the 8080 (CP/M) version, but it does use the 8086's new capabilities where possible, e.g. multiplication and division, and the string lookups are done using an 8086 string instruction.

This code is written to compile to a .COM file using nasm.

<lang asm> ;; DDATE for MS-DOS (assembles using nasm) bits 16 cpu 8086 tlength: equ 80h cmdtail: equ 81h putch: equ 2 puts: equ 9 getdate: equ 2Ah org 100h section .text ;; Check if a date was given mov bl,[tlength] ; Length of command line and bl,bl ; Is it zero? jz gettoday ; Then get today's date ;; Parse the date given on the command line cmp bl,10+1 ; MM/DD/YYYY is ten characters long jne printusage ; If it doesn't match, print usage. xor bh,bh add bx,cmdtail mov byte [bx],0 ; Zero terminate the date mov si,cmdtail+1 ; Get month, call atoi mov dh,al ; store in DH, inc si ; get day, call atoi mov dl,al ; store in DL, inc si ; get year, call atoi mov cx,ax ; and store in CX. jmp convertdate ;; Ask MS-DOS for the date gettoday: mov ah,puts ; Prefix output with 'Today is ' mov dx,todayis int 21h mov ah,getdate ; And get the current date. int 21h ;; Convert the date to the Discordian calendar ;; (DL=day, DH=month, CX=year) convertdate: add cx,1166 ; Erisian year is 1166 years onwards. cmp dx,21dh ; Is it St. Tib's Day? jne notibs mov dx,tibsday ; If yes, print "St. Tib's Day" mov ah,puts int 21h ;; Print "in the YOLD NNNN" and then end. intheyold: mov dx,yold ; In the YOLD mov ah,puts int 21h mov ax,cx ; print the year call printn ret ; If Tibs, this ends the program. ;; It isn't St. Tib's Day. notibs: cmp dh,1 ; Month < 1 = error jb printinval cmp dl,1 ; Day < 1 = error jb printinval cmp dh,12 ; Month > 12 = error ja printinval mov bx,monthlengths-1 xor ah,ah ; Day higher than it should be mov al,dh ; (according to month table) add bx,ax ; = error cmp dl,[bx] ja printinval mov bx,monthdays-2 ; Calculate day of year mov al,dh ; Cumulative months sal al,1 ; Multiply by 2 (2 bits per entry) add bx,ax mov ax,[bx] ; Days since start of month xor dh,dh add dx,ax ; Add day of month dec dx ; Start at 0 (For array lookup) mov ax,dx ; Get weekday mov bl,5 ; Divide by 5 div bl ; AH = weekday (modulo) mov bl,ah mov di,weekdays call strselect ; Print the weekday mov bx,dx ; Keep day of year in bx for now mov dx,commaday ; ... ', day ' call printstr mov dl,73 ; Each season is 73 days long mov ax,bx ; Divide day of year by 73 div dl ; DH=AH=day of season (modulo) mov dx,ax ; DL=AL=season number xor ah,ah ; Print day of season mov al,dh inc al ; One more (days do start at 1) call printn mov bx,dx ; Store day and season in bx mov dx,of ; Print ... ' of ' call printstr mov dx,bx ; Day and season in dx again mov di,seasons ; Print season call strselect ; BL is still season number mov bx,dx ; Day and season in BX again. call intheyold ; Print the year cmp bh,5-1 ; Something to celebrate? je party ; (Day 5 or 50? cmp bh,50-1 je party ret ; If not, stop. party: mov al,bh ; Day in AL. mov bx,holydays5 ; Day 5 holydays. mov cx,xday cmp al,50-1 ; Unless it's 50 jne holyday mov bx,holydays50 ; Then we need day 50 holydays. mov cx,xflux holyday: mov dx,celebrate ; Print ... ', celebrate: ' call printstr mov dx,bx call printstr mov dx,cx jmp printstr ;; Print "invalid date". printinval: mov dx,inval jmp printstr ;; Print usage. printusage: mov dx,usage ;; Print DX. printstr: mov ah,puts int 21h ret ;; Subroutine: print the BL'th string from DI strselect: inc bl ; Counter the 'dec bl' later mov al,'$' ; String end push cx ; Keep registers push dx .search dec bl ; Are we there yet? jz .found mov cx,-1 repne scasb ; Scan to end of string jmp .search .found mov dx,di ; Found the string, print it mov ah,puts int 21h pop dx ; Restore registers pop cx ret ;; Subroutine: print number in AX. printn: push cx ; Don't trample registers push dx mov si,numend ; End of number string. mov cx,10 ; Divisor, ten. .loop xor dx,dx ; Zero DX. dec si ; Back up one digit. div cx ; Divide AX by ten. add dl,'0' ; Remainder is now in DX; make ASCII mov [si],dl ; and store. and ax,ax ; Quotient is in AX, check if zero jnz .loop ; loop for next digit if there is one. mov dx,si ; Print SI - move it to DX, mov ah,puts ; and then call the DOS print function int 21h pop dx ; Restore the registers pop cx ret ;; Subroutine: parse number at [SI], store in AX. atoi: push bx ; Don't trample registers push cx push dx xor ax,ax ; Zero AX. xor bh,bh ; BH as well. mov cx,10 ; Multiplier, ten. .loop mov bl,[si] ; Current number. sub bl,'0' ; Subtract '0'. jc .done ; If <0, then done. cmp bl,9 ; If it's higher than 9, jnbe .done ; also done. mul cx ; Multiply accumulator by 10 add ax,bx ; Add the digit in. inc si ; Next digit jmp .loop .done pop dx ; Restore registers pop cx pop bx ret section .data ;; Accumulated days at start of Gregorian months monthdays: dw 0,31,59,90,120,151,181,212,243,273,304,334 ;; Days per month monthlengths: db 31,28,31,30,31,30,31,31,30,31,30,31 ;; Strings inval: db 'Invalid date.$' usage: db `DDATE [MM/DD/YYYY]\r\n` db `\r\n\tPrint today's date or the given date in the` db ` Discordian calendar.$` number: db '00000' numend: db '$' todayis: db 'Today is $' weekdays: db 'Sweetmorn$Boomtime$Pungenday$Prickle-Prickle$' db 'Setting Orange$' commaday: db ', day $' of: db ' of $' seasons: db 'Chaos$Discord$Confusion$Bureaucracy$The Aftermath$' celebrate: db ': celebrate $' holydays5: db 'Mung$Mojo$Sya$Zara$Mala$' xday: db 'day!$' holydays50: db 'Chao$Disco$Confu$Bure$Af$' xflux: db 'flux!$' tibsday: db "Saint Tib's Day$" yold: db ' in the YOLD $'</lang>

Output:

C:\>ddate
Today is Pungenday, day 50 of Discord in the YOLD 3186: celebrate Chaoflux!
C:\>ddate 09/26/1995
Prickle-Pricke, day 50 of Bureaucracy in the YOLD 3161: celebrate Chaoflux!
C:\>ddate 02/29/1996
Saint Tib's Day in the YOLD 3162
C:\>ddate 07/22/2011
Pungenday, day 57 of Confusion in the YOLD 3177
C:\>ddate 01/05/2005
Setting Orange, day 5 of Chaos in the YOLD 3171: celebrate Mungday!

Ada

discordian.adb: <lang Ada>with Ada.Calendar.Arithmetic; with Ada.Text_IO; with Ada.Integer_Text_IO; with Ada.Strings.Unbounded; with Ada.Strings.Unbounded.Text_IO; with Ada.Command_Line;

procedure Discordian is

  use Ada.Calendar;
  use Ada.Strings.Unbounded;
  use Ada.Command_Line;
  package UStr_IO renames Ada.Strings.Unbounded.Text_IO;

  subtype Year_Number is Integer range 3067 .. 3565;
  type Seasons is (Chaos, Discord, Confusion, Bureaucracy, The_Aftermath);
  type Days_Of_Week is (Sweetmorn, Boomtime, Pungenday,
                        Prickle_Prickle, Setting_Orange);
  subtype Day_Number is Integer range 1 .. 73;

  type Discordian_Date is record
     Year        : Year_Number;
     Season      : Seasons;
     Day         : Day_Number;
     Week_Day    : Days_Of_Week;
     Is_Tibs_Day : Boolean := False;
  end record;

  function Week_Day_To_Str(Day : Days_Of_Week) return Unbounded_String is
     s : Unbounded_String;
  begin
     case Day is
        when Sweetmorn       => s := To_Unbounded_String("Sweetmorn");
        when Boomtime        => s := To_Unbounded_String("Boomtime");
        when Pungenday       => s := To_Unbounded_String("Pungenday");
        when Prickle_Prickle => s := To_Unbounded_String("Prickle-Prickle");
        when Setting_Orange  => s := To_Unbounded_String("Setting Orange");
     end case;
     return s;
  end Week_Day_To_Str;

  function Holiday(Season: Seasons) return Unbounded_String is
     s : Unbounded_String;
  begin
     case Season is
        when Chaos         => s := To_Unbounded_String("Chaoflux");
        when Discord       => s := To_Unbounded_String("Discoflux");
        when Confusion     => s := To_Unbounded_String("Confuflux");
        when Bureaucracy   => s := To_Unbounded_String("Bureflux");
        when The_Aftermath => s := To_Unbounded_String("Afflux");
     end case;
     return s;
  end Holiday;

  function Apostle(Season: Seasons) return Unbounded_String is
     s : Unbounded_String;
  begin
     case Season is
        when Chaos         => s := To_Unbounded_String("Mungday");
        when Discord       => s := To_Unbounded_String("Mojoday");
        when Confusion     => s := To_Unbounded_String("Syaday");
        when Bureaucracy   => s := To_Unbounded_String("Zaraday");
        when The_Aftermath => s := To_Unbounded_String("Maladay");
     end case;
     return s;
  end Apostle;

  function Season_To_Str(Season: Seasons) return Unbounded_String is
     s : Unbounded_String;
  begin
     case Season is
        when Chaos         => s := To_Unbounded_String("Chaos");
        when Discord       => s := To_Unbounded_String("Discord");
        when Confusion     => s := To_Unbounded_String("Confusion");
        when Bureaucracy   => s := To_Unbounded_String("Bureaucracy");
        when The_Aftermath => s := To_Unbounded_String("The Aftermath");
     end case;
     return s;
  end Season_To_Str;

  procedure Convert (From : Time; To : out Discordian_Date) is
     use Ada.Calendar.Arithmetic;
     First_Day   : Time;
     Number_Days : Day_Count;
     Leap_Year   : boolean;
  begin
     First_Day   := Time_Of (Year => Year (From), Month => 1, Day => 1);
     Number_Days := From - First_Day;

     To.Year        := Year (Date => From) + 1166;
     To.Is_Tibs_Day := False;
     Leap_Year := False;
     if Year (Date => From) mod 4 = 0 then
         if Year (Date => From) mod 100 = 0 then
             if Year (Date => From) mod 400 = 0 then
                 Leap_Year := True;
             end if;
         else
             Leap_Year := True;
         end if;
     end if;
     if Leap_Year then
        if Number_Days > 59 then
           Number_Days := Number_Days - 1;
        elsif Number_Days = 59 then
           To.Is_Tibs_Day := True;
        end if;
     end if;
     To.Day := Day_Number (Number_Days mod 73 + 1);
     case Number_Days / 73 is
        when 0 => To.Season := Chaos;
        when 1 => To.Season := Discord;
        when 2 => To.Season := Confusion;
        when 3 => To.Season := Bureaucracy;
        when 4 => To.Season := The_Aftermath;
        when others => raise Constraint_Error;
     end case;
     case Number_Days mod 5 is
        when 0 => To.Week_Day := Sweetmorn;
        when 1 => To.Week_Day := Boomtime;
        when 2 => To.Week_Day := Pungenday;
        when 3 => To.Week_Day := Prickle_Prickle;
        when 4 => To.Week_Day := Setting_Orange;
        when others => raise Constraint_Error;
     end case;
  end Convert;

  procedure Put (Item : Discordian_Date) is
  begin
     if Item.Is_Tibs_Day then
        Ada.Text_IO.Put ("St. Tib's Day");
     else
        UStr_IO.Put (Week_Day_To_Str(Item.Week_Day));
        Ada.Text_IO.Put (", day" & Integer'Image (Item.Day));
        Ada.Text_IO.Put (" of ");
        UStr_IO.Put (Season_To_Str (Item.Season));
        if Item.Day = 5 then
           Ada.Text_IO.Put (", ");
           UStr_IO.Put (Apostle(Item.Season));
        elsif Item.Day = 50 then
           Ada.Text_IO.Put (", ");
           UStr_IO.Put (Holiday(Item.Season));
        end if;
     end if;
     Ada.Text_IO.Put (" in the YOLD" & Integer'Image (Item.Year));
     Ada.Text_IO.New_Line;
  end Put;

  Test_Day  : Time;
  Test_DDay : Discordian_Date;
  Year : Integer;
  Month : Integer;
  Day : Integer;
  YYYYMMDD : Integer;

begin

  if Argument_Count = 0 then
     Test_Day := Clock;
     Convert (From => Test_Day, To => Test_DDay);
     Put (Test_DDay);
  end if;

  for Arg in 1..Argument_Count loop

     if Argument(Arg)'Length < 8 then
        Ada.Text_IO.Put("ERROR: Invalid Argument : '" & Argument(Arg) & "'");
        Ada.Text_IO.Put("Input format YYYYMMDD");
        raise Constraint_Error;
     end if;

     begin
        YYYYMMDD := Integer'Value(Argument(Arg));
     exception
        when Constraint_Error =>
           Ada.Text_IO.Put("ERROR: Invalid Argument : '" & Argument(Arg) & "'");
           raise;
     end;

     Day := YYYYMMDD mod 100;
     if Day < Day_Number'First or Day > Day_Number'Last then
        Ada.Text_IO.Put("ERROR: Invalid Day:" & Integer'Image(Day));
        raise Constraint_Error;
     end if;

     Month := ((YYYYMMDD - Day) / 100) mod 100;
     if Month < Month_Number'First or Month > Month_Number'Last then
        Ada.Text_IO.Put("ERROR: Invalid Month:" & Integer'Image(Month));
        raise Constraint_Error;
     end if;

     Year := ((YYYYMMDD - Day - Month * 100) / 10000);
     if Year < 1901 or Year > 2399 then
        Ada.Text_IO.Put("ERROR: Invalid Year:" & Integer'Image(Year));
        raise Constraint_Error;
     end if;

     Test_Day := Time_Of (Year => Year, Month => Month, Day => Day);

     Convert (From => Test_Day, To => Test_DDay);
     Put (Test_DDay);

  end loop;

end Discordian; </lang>

Output:

$ ./discordian 21001231 20120228 20120229 20120301 20100722 20120902 20121231
Setting Orange, day 73 of The Aftermath in the YOLD 3266
Prickle-Prickle, day 59 of Chaos in the YOLD 3178
St. Tib's Day in the YOLD 3178
Setting Orange, day 60 of Chaos in the YOLD 3178
Pungenday, day 57 of Confusion in the YOLD 3176
Setting Orange, day 26 of Bureaucracy in the YOLD 3178
Setting Orange, day 73 of The Aftermath in the YOLD 3178

ALGOL 68

Translation of: ALGOL W

which was itself,

Translation of: MAD

Algol 68 has variable length strings which simplifies this a lot relative to the Algol W version. <lang algol68>BEGIN # DISCORDIAN DATE CALCULATION - TRANSLATION OF MAD VIA ALGOL W #

   INT      greg, gmonth, gday, gyear;
   []STRING holys  = []STRING( "MUNG", "MOJO",  "SYA",   "ZARA", "MALA" )[ AT 0 ];
   []STRING holys0 = []STRING( "CHAO", "DISCO", "CONFU", "BURE", "AF"   )[ AT 0 ];
   []STRING disday = []STRING( "SWEETMORN", "BOOMTIME", "PUNGENday", "PRICKLE-PRICKLE", "SETTING ORANGE" )[ AT 0 ];
   []STRING disssn = []STRING( "CHAOS",     "DISCORD",  "CONFUSION", "BUREAUCRACY",     "THE AFTERMATH"  )[ AT 0 ];
   []INT    mlengt = []INT( 0, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 )[ AT 0 ];
   CHAR     slash1, slash2;

   # input date should contain MM/DD/YYYY in the gregorian calendar      #
   read( ( gmonth, slash1, gday, slash2, gyear ) );  
   IF slash1 /= "/" OR slash2 /= "/" THEN print( ( "Invalid date format", newline ) ); stop FI;

   IF gmonth = 2 AND gday = 29
   THEN print( ( "SAINT TIB'S DAY IN THE Y.O.L.D. ", whole( gyear + 1166, -4 ), newline ) )
   ELSE 
       INT yrday  := mlengt[ gmonth ] + gday;
       INT season := yrday OVER 73;
       INT day    := yrday - ( season * 73 );
       INT wkday  := ( yrday - 1 ) MOD 5;
       print( ( disday[ wkday ], ", DAY ", whole( day, -2 ), " OF ", disssn[ season ]
              , " IN THE Y.O.L.D ", whole( gyear + 1166, 0 ), newline
              )
            );
       IF   day = 5  THEN print( ( "CELEBRATE ", holys[  season ], "DAY"  ) )
       ELIF day = 50 THEN print( ( "CELEBRATE ", holys0[ season ], "FLUX" ) )
       FI
   FI

END</lang>

Output:

11/04/1167
PUNGENday, day 16 OF THE AFTERMATH IN THE Y.O.L.D 2333

08/15/2017
BOOMTIME, DAY  8 OF BUREAUCRACY IN THE Y.O.L.D 3183

12/06/2020
SETTING ORANGE, DAY 48 OF THE AFTERMATH IN THE Y.O.L.D 3186

07/12/1969
PUNGENday, DAY 47 OF CONFUSION IN THE Y.O.L.D 3135

07/05/2005
SWEETMORN, DAY 40 OF CONFUSION IN THE Y.O.L.D 3171

09/26/1995
PRICKLE-PRICKLE, DAY 50 OF BUREAUCRACY IN THE Y.O.L.D 3161
CELEBRATE BUREFLUX

11/30/2021
PRICKLE-PRICKLE, DAY 42 OF THE AFTERMATH IN THE Y.O.L.D 3187

ALGOL W

Translation of: MAD

Algol W doesn't have the array initialisation equivalent of MAD's VECTOR VALUES and also does not allow implicit declarations. Algol W does not have I/O formsts or variable length strings in output, which makes this version somewhat longer. <lang algolw>BEGIN % DISCORDIAN DATE CALCULATION - TRANSLATION OF MAD %

   INTEGER          GREG, GMONTH, GDAY, GYEAR;
   STRING(16) ARRAY HOLY5  ( 0 ::  4 );
   STRING(16) ARRAY HOLY50 ( 0 ::  4 );
   STRING(16) ARRAY DISDAY ( 0 ::  4 );
   STRING(16) ARRAY DISSSN ( 0 ::  4 );
   INTEGER    ARRAY MLENGT ( 0 :: 12 );
   INTEGER          APOS;
   STRING(1)        SLASH1, SLASH2;

   % WRITES A "$" TERMINATED STRING                                      %
   PROCEDURE WRITEONTEXT( STRING(16) VALUE TEXT ) ;
   BEGIN
       INTEGER TPOS;
       TPOS := 0;
       WHILE TPOS < 16 DO BEGIN
           IF TEXT( TPOS // 1 ) = "$"
           THEN TPOS := 32
           ELSE WRITEON( TEXT( TPOS // 1 ) );
           ;
           TPOS := TPOS + 1
       END WHILE_TPOS_LT_16
   END WRITEONTEXT;

   APOS := 0;
   FOR M := 0,0,31,59,90,120,151,181,212,243,273,304,334 DO BEGIN MLENGT(APOS) := M; APOS := APOS + 1 END;
   HOLY5 (0) := "MUNG$";HOLY5 (1) := "MOJO$"; HOLY5 (2) := "SYA$";  HOLY5 (3) := "ZARA$"; HOLY5 (4) := "MALA$";
   HOLY50(0) := "CHAO$";HOLY50(1) := "DISCO$";HOLY50(2) := "CONFU$";HOLY50(3) := "BURE$"; HOLY50(4) := "AF$";
   DISDAY(0) := "SWEETMORN$";       DISDAY(1) := "BOOMTIME$";      DISDAY(2) := "PUNGENDAY$";
   DISDAY(3) := "PRICKLE-PRICKLE$"; DISDAY(4) := "SETTING ORANGE$";
   DISSSN(0) := "CHAOS$"; DISSSN(1) := "DISCORD$"; DISSSN(2) := "CONFUSION$";
   DISSSN(3) := "BUREAUCRACY$"; DISSSN(4) := "THE AFTERMATH$";

   % INPUT DATE SHOULD CONTAIN MM/DD/YYYY IN GREGORIAN CALENDAR          %
   READ( GMONTH, SLASH1, GDAY, SLASH2, GYEAR );  

   IF GMONTH = 2 AND GDAY = 29
   THEN WRITE( I_W := 4, S_W := 0, "SAINT TIB'S DAY IN THE Y.O.L.D. ", GYEAR + 1166 )
   ELSE BEGIN
       INTEGER YRDAY, SEASON, DAY, WKDAY;
       YRDAY  := MLENGT(GMONTH)+GDAY;
       SEASON := YRDAY DIV 73;
       DAY    := YRDAY-SEASON*73;
       WKDAY  := (YRDAY-1) REM 5;
       WRITEONTEXT( DISDAY(WKDAY) );
       WRITEON( S_W := 0, ", DAY ", I_W := 2, DAY, " OF " );
       WRITEONTEXT( DISSSN(SEASON) );
       WRITEON( S_W := 0, " IN THE Y.O.L.D ", I_W := 4, GYEAR + 1166 );
       IF      DAY = 5  THEN BEGIN
           WRITE( "CELEBRATE " );WRITEONTEXT( HOLY5(SEASON) );  WRITEON( "DAY"  )
           END
       ELSE IF DAY = 50 THEN BEGIN
           WRITE( "CELEBRATE " );WRITEONTEXT( HOLY50(SEASON) ); WRITEON( "FLUX" )
       END IF_FAY_EQ_5__DAY_EQ_50
   END

END.</lang>

Output:

08/15/2017
BOOMTIME, DAY  8 OF BUREAUCRACY IN THE Y.O.L.D 3183

12/06/2020
SETTING ORANGE, DAY 48 OF THE AFTERMATH IN THE Y.O.L.D 3186

07/12/1969
PUNGENDAY, DAY 47 OF CONFUSION IN THE Y.O.L.D 3135

01/05/2005
SETTING ORANGE, DAY  5 OF CHAOS IN THE Y.O.L.D 3171
CELEBRATE MUNGDAY

09/26/1995
PRICKLE-PRICKLE, DAY 50 OF BUREAUCRACY IN THE Y.O.L.D 3161
CELEBRATE BUREFLUX

AppleScript

<lang applescript>on gregorianToDiscordian(inputDate) -- Input: AppleScript date object.

   (*
       Discordian years are aligned with, and the same length as, Gregorian years.
       Each has 73 5-day weeks and 5 73-day seasons. (73 * 5 = 365.)
       The first day of a Discordian year is also that of its first week and first season.
       In leap years, an extra day called "St. Tib's Day", is inserted between days 59 and 60.
       It's considered to be outside the calendar, so the day after it is Setting Orange, Chaos 60,
       not Sweetmorn, Chaos 61. Year 1 YOLD is 1166 BC, but this handler takes an AS date object
       as its input and is only good for AD Gregorian dates. Since the Discordian calendar's an
       American invention, the output here's in the US style: "Weekday, Season day, year".
   *)
   -- Calculate the input date's day-of-year number.
   copy inputDate to startOfYear
   tell startOfYear to set {its day, its month} to {1, January}
   set dayOfYear to (inputDate - startOfYear) div days + 1
   
   -- If it's a leap year, special-case St. Tib's Day, or adjust the day-of-year number if the day comes after that.
   set y to inputDate's year
   if ((y mod 4 is 0) and ((y mod 100 > 0) or (y mod 400 is 0))) then
       if (dayOfYear is 60) then
           set dayOfYear to "St. Tib's Day"
       else if (dayOfYear > 60) then
           set dayOfYear to dayOfYear - 1
       end if
   end if
   
   -- Start the output text with either "St. Tib's Day" or the weekday, season, and day-of-season number.
   if (dayOfYear is "St. Tib's Day") then
       set outputText to dayOfYear
   else
       tell dayOfYear - 1
           set dayOfWeek to it mod 5 + 1
           set seasonNumber to it div 73 + 1
           set dayOfSeason to it mod 73 + 1
       end tell
       set theWeekdays to {"Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange"}
       set theSeasons to {"Chaos ", "Discord ", "Confusion ", "Bureaucracy ", "The Aftermath "}
       set outputText to (item dayOfWeek of theWeekdays) & ", " & (item seasonNumber of theSeasons) & dayOfSeason
   end if
   
   -- Append the Discordian year number and return the result.
   return outputText & ", " & (y + 1166)

end gregorianToDiscordian

set ASDate to (current date) set gregorianDate to ASDate's date string set discordianDate to gregorianToDiscordian(ASDate) return {Gregorian:gregorianDate, Discordian:discordianDate}</lang>

Output:

<lang applescript>{Gregorian:"Saturday 5 December 2020", Discordian:"Prickle-Prickle, The Aftermath 47, 3186"}</lang>

AWK

DDATE.AWK - Gregorian to Discordian date contributed by Dan Nielsen
syntax: GAWK -f DDATE.AWK [YYYYMMDD | YYYY-MM-DD | MM-DD-YYYY | DDMMMYYYY | YYYY] ...
examples:
GAWK -f DDATE.AWK today
GAWK -f DDATE.AWK 20110722 one date
GAWK -f DDATE.AWK 20110722 20120229 two dates
GAWK -f DDATE.AWK 2012 yearly calendar

BEGIN {

   split("Chaos,Discord,Confusion,Bureaucracy,The Aftermath",season_arr,",")
   split("Sweetmorn,Boomtime,Pungenday,Prickle-Prickle,Setting Orange",weekday_arr,",")
   split("Mungday,Mojoday,Syaday,Zaraday,Maladay",apostle_holyday_arr,",")
   split("Chaoflux,Discoflux,Confuflux,Bureflux,Afflux",season_holyday_arr,",")
   split("31,28,31,30,31,30,31,31,30,31,30,31",days_in_month,",") # days per month in non leap year
   split("0   31  59  90  120 151 181 212 243 273 304 334",rdt," ") # relative day table
   mmm = "JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC"

1 2 3 4 5 6 7 8 9 10 11 12

   if (ARGV[1] == "") { # use current date
     ARGV[ARGC++] = strftime("%Y%m%d") # GAWK only
   # ARGV[ARGC++] = dos_date() # any AWK
   # timetab(arr); ARGV[ARGC++] = sprintf("%04d%02d%02d",arr["YEAR"],arr["MONTH"],arr["DAY"]) # TAWK only
   }
   for (argno=1; argno<=ARGC-1; argno++) { # validate command line arguments
     print("")
     x = toupper(ARGV[argno])
     if (x ~ /^[0-9][0-9][0-9][0-9][01][0-9][0-3][0-9]$/) { # YYYYMMDD
       main(x)
     }
     else if (x ~ /^[0-9][0-9][0-9][0-9]-[01][0-9]-[0-3][0-9]$/) { # YYYY-MM-DD
       gsub(/-/,"",x)
       main(x)
     }
     else if (x ~ /^[01][0-9]-[0-3][0-9]-[0-9][0-9][0-9][0-9]$/) { # MM-DD-YYYY
       main(substr(x,7,4) substr(x,1,2) substr(x,4,2))
     }
     else if (x ~ /^[0-3][0-9](JAN|FEB|MAR|APR|MAY|JUN|JUL|AUG|SEP|OCT|NOV|DEC)[0-9][0-9][0-9][0-9]$/) { # DDMMMYYYY
       main(sprintf("%04d%02d%02d",substr(x,6,4),int((match(mmm,substr(x,3,3))/4)+1),substr(x,1,2)))
     }
     else if (x ~ /^[0-9][0-9][0-9][0-9]$/) { # YYYY
       yearly_calendar(x)
     }
     else {
       error("begin")
     }
   }
   if (errors == 0) { exit(0) } else { exit(1) }

} function main(x, d,dyear,m,season_day,season_nbr,text,weekday_nbr,y,year_day) {

   y = substr(x,1,4) + 0
   m = substr(x,5,2) + 0
   d = substr(x,7,2) + 0
   days_in_month[2] = (leap_year(y) == 1) ? 29 : 28
   if (m < 1 || m > 12 || d < 1 || d > days_in_month[m]+0) {
     error("main")
     return
   }
   year_day = rdt[m] + d
   dyear = y + 1166 # Discordian year
   season_nbr = int((year_day - 1 ) / 73) + 1
   season_day = ((year_day - 1) % 73) + 1
   weekday_nbr = ((year_day - 1 ) % 5) + 1
   if (season_day == 5) {
     text = ", " apostle_holyday_arr[season_nbr]
   }
   else if (season_day == 50) {
     text = ", " season_holyday_arr[season_nbr]
   }
   if (leap_year(y) && m == 2 && d == 29) {
     printf("%04d-%02d-%02d is St. Tib's day, Year of Our Lady of Discord %s\n",y,m,d,dyear)
   }
   else {
     printf("%04d-%02d-%02d is %s, %s %s, Year of Our Lady of Discord %s%s\n",
     y,m,d,weekday_arr[weekday_nbr],season_arr[season_nbr],season_day,dyear,text)
   }

} function leap_year(y) { # leap year: 0=no, 1=yes

   return (y % 400 == 0 || (y % 4 == 0 && y % 100)) ? 1 : 0

} function yearly_calendar(y, d,m) {

   days_in_month[2] = (leap_year(y) == 1) ? 29 : 28
   for (m=1; m<=12; m++) {
     for (d=1; d<=days_in_month[m]; d++) {
       main(sprintf("%04d%02d%02d",y,m,d))
     }
   }

} function dos_date( arr,cmd,d,x) { # under Microsoft Windows

XP - The current date is: MM/DD/YYYY
8 - The current date is: DOW MM/DD/YYYY

   cmd = "DATE <NUL"
   cmd | getline x
   close(cmd) # close pipe
   d = arr[split(x,arr," ")]
   return sprintf("%04d%02d%02d",substr(d,7,4),substr(d,1,2),substr(d,4,2))

} function error(x) {

   printf("error: argument %d is invalid, %s, in %s\n",argno,ARGV[argno],x)
   errors++

} </lang>

Output:

GAWK -f DDATE.AWK
2011-08-22 is Prickle-Prickle, Bureaucracy 15, Year of Our Lady of Discord 3177

GAWK -f DDATE.AWK 20110722 20120229
2011-07-22 is Pungenday, Confusion 57, Year of Our Lady of Discord 3177
2012-02-29 is St. Tib's day, Year of Our Lady of Discord 3178

BASIC

Works with: FreeBASIC

Translation of: PowerBASIC

<lang qbasic>#INCLUDE "datetime.bi"

DECLARE FUNCTION julian(AS DOUBLE) AS INTEGER

SeasonNames: DATA "Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath" Weekdays: DATA "Setting Orange", "Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle" DaysPreceding1stOfMonth: ' jan feb mar apr may jun jul aug sep oct nov dec DATA 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334

DIM dyear AS INTEGER, dseason AS STRING, dday AS INTEGER, dweekday AS STRING DIM tmpdate AS DOUBLE, jday AS INTEGER, result AS STRING DIM L0 AS INTEGER

IF LEN(COMMAND$) THEN

   tmpdate = DATEVALUE(COMMAND$)

ELSE

   tmpdate = FIX(NOW())

END IF dyear = YEAR(tmpdate) + 1166 IF (2 = MONTH(tmpdate)) AND (29 = DAY(tmpdate)) THEN

   result = "Saint Tib's Day, " & STR$(dyear) & " YOLD"

ELSE

   jday = julian(tmpdate)
   RESTORE SeasonNames
   FOR L0 = 1 TO ((jday - 1) \ 73) + 1
   	READ dseason
   NEXT
   dday = (jday MOD 73)
   IF 0 = dday THEN dday = 73
   RESTORE Weekdays
   FOR L0 = 1 TO (jday MOD 5) + 1
       READ dweekday
   NEXT
   result = dweekday & ", " & dseason & " " & TRIM$(STR$(dday)) & ", " & TRIM$(STR$(dyear)) & " YOLD"

END IF

? result END

FUNCTION julian(d AS DOUBLE) AS INTEGER

   'doesn't account for leap years (not needed for ddate)
   DIM tmp AS INTEGER, L1 AS INTEGER
   RESTORE DaysPreceding1stOfMonth
   FOR L1 = 1 TO MONTH(d)
       READ tmp
   NEXT
   FUNCTION = tmp + DAY(d)

END FUNCTION</lang>

Output:

"Discordian date.exe" 19-10-2015 
Boomtime, Bureaucracy 73, 3181 YOLD

Batch File

Works with: Windows XP Service Pack 3

<lang dos>@echo off goto Parse

Discordian Date Converter:

Usage:

ddate ddate /v ddate /d isoDate ddate /v /d isoDate

Parse

shift if "%0"=="" goto Prologue if "%0"=="/v" set Verbose=1 if "%0"=="/d" set dateToTest=%1 if "%0"=="/d" shift goto Parse

Prologue

if "%dateToTest%"=="" set dateToTest=%date% for %%a in (GYear GMonth GDay GMonthName GWeekday GDayThisYear) do set %%a=fnord for %%a in (DYear DMonth DDay DMonthName DWeekday) do set %%a=MUNG goto Start

Start

for /f "tokens=1,2,3 delims=/:;-. " %%a in ('echo %dateToTest%') do ( set GYear=%%a set GMonth=%%b set GDay=%%c ) goto GMonthName

GMonthName

if %GMonth% EQU 1 set GMonthName=January if %GMonth% EQU 2 set GMonthName=February if %GMonth% EQU 3 set GMonthName=March if %GMonth% EQU 4 set GMonthName=April if %GMonth% EQU 5 set GMonthName=May if %GMonth% EQU 6 set GMonthName=June if %GMonth% EQU 7 set GMonthName=July if %GMonth% EQU 8 set GMonthName=August if %GMonth% EQU 9 set GMonthName=September if %GMonth% EQU 10 set GMonthName=October if %GMonth% EQU 11 set GMonthName=November if %GMonth% EQU 12 set GMonthName=December goto GLeap

GLeap

set /a CommonYear=GYear %% 4 set /a CommonCent=GYear %% 100 set /a CommonQuad=GYear %% 400 set GLeap=0 if %CommonYear% EQU 0 set GLeap=1 if %CommonCent% EQU 0 set GLeap=0 if %CommonQuad% EQU 0 set GLeap=1 goto GDayThisYear

GDayThisYear

set GDayThisYear=%GDay% if %GMonth% GTR 11 set /a GDayThisYear=%GDayThisYear%+30 if %GMonth% GTR 10 set /a GDayThisYear=%GDayThisYear%+31 if %GMonth% GTR 9 set /a GDayThisYear=%GDayThisYear%+30 if %GMonth% GTR 8 set /a GDayThisYear=%GDayThisYear%+31 if %GMonth% GTR 7 set /a GDayThisYear=%GDayThisYear%+31 if %GMonth% GTR 6 set /a GDayThisYear=%GDayThisYear%+30 if %GMonth% GTR 5 set /a GDayThisYear=%GDayThisYear%+31 if %GMonth% GTR 4 set /a GDayThisYear=%GDayThisYear%+30 if %GMonth% GTR 3 set /a GDayThisYear=%GDayThisYear%+31 if %GMonth% GTR 2 if %GLeap% EQU 1 set /a GDayThisYear=%GDayThisYear%+29 if %GMonth% GTR 2 if %GLeap% EQU 0 set /a GDayThisYear=%GDayThisYear%+28 if %GMonth% GTR 1 set /a GDayThisYear=%GDayThisYear%+31 goto DYear

DYear

set /a DYear=GYear+1166 goto DMonth

DMonth

set DMonth=1 set DDay=%GDayThisYear% if %DDay% GTR 73 ( set /a DDay=%DDay%-73 set /a DMonth=%DMonth%+1 ) if %DDay% GTR 73 ( set /a DDay=%DDay%-73 set /a DMonth=%DMonth%+1 ) if %DDay% GTR 73 ( set /a DDay=%DDay%-73 set /a DMonth=%DMonth%+1 ) if %DDay% GTR 73 ( set /a DDay=%DDay%-73 set /a DMonth=%DMonth%+1 ) goto DDay

DDay

if %GLeap% EQU 1 ( if %GDayThisYear% GEQ 61 ( set /a DDay=%DDay%-1 ) ) if %DDay% EQU 0 ( set /a DDay=73 set /a DMonth=%DMonth%-1 ) goto DMonthName

DMonthName

if %DMonth% EQU 1 set DMonthName=Chaos if %DMonth% EQU 2 set DMonthName=Discord if %DMonth% EQU 3 set DMonthName=Confusion if %DMonth% EQU 4 set DMonthName=Bureaucracy if %DMonth% EQU 5 set DMonthName=Aftermath goto DTib

DTib

set DTib=0 if %GDayThisYear% EQU 60 if %GLeap% EQU 1 set DTib=1 if %GLeap% EQU 1 if %GDayThisYear% GTR 60 set /a GDayThisYear=%GDayThisYear%-1 set DWeekday=%GDayThisYear% goto DWeekday

DWeekday

if %DWeekday% LEQ 5 goto _DWeekday set /a DWeekday=%DWeekday%-5 goto DWeekday

_DWeekday

if %DWeekday% EQU 1 set DWeekday=Sweetmorn if %DWeekday% EQU 2 set DWeekday=Boomtime if %DWeekday% EQU 3 set DWeekday=Pungenday if %DWeekday% EQU 4 set DWeekday=Prickle-Prickle if %DWeekday% EQU 5 set DWeekday=Setting Orange goto GWeekday

GWeekday

goto GEnding

GEnding

set GEnding=th for %%a in (1 21 31) do if %GDay% EQU %%a set GEnding=st for %%a in (2 22) do if %GDay% EQU %%a set GEnding=nd for %%a in (3 23) do if %GDay% EQU %%a set GEnding=rd goto DEnding

DEnding

set DEnding=th for %%a in (1 21 31 41 51 61 71) do if %Dday% EQU %%a set DEnding=st for %%a in (2 22 32 42 52 62 72) do if %Dday% EQU %%a set DEnding=nd for %%a in (3 23 33 43 53 63 73) do if %Dday% EQU %%a set DEnding=rd goto Display

Display

if "%Verbose%"=="1" goto Display2 echo. if %DTib% EQU 1 ( echo St. Tib's Day, %DYear% ) else echo %DWeekday%, %DMonthName% %DDay%%DEnding%, %DYear% goto Epilogue

Display2

echo. echo Gregorian: %GMonthName% %GDay%%GEnding%, %GYear% if %DTib% EQU 1 ( echo Discordian: St. Tib's Day, %DYear% ) else echo Discordian: %DWeekday%, %DMonthName% %DDay%%DEnding%, %DYear% goto Epilogue

Epilogue

set Verbose= set dateToTest= echo.

End

</lang>

Output:

H:\>ddate

Pungenday, Confusion 12th, 3182

H:\>ddate /v

 Gregorian: June 07th, 2016
Discordian: Pungenday, Confusion 12th, 3182

H:\>ddate /d 2016-02-28

Prickle-Prickle, Chaos 59th, 3182

H:\>ddate /v /d 2016-02-28

 Gregorian: February 28th, 2016
Discordian: Prickle-Prickle, Chaos 59th, 3182

H:\>ddate /v /d 2016-02-29

 Gregorian: February 29th, 2016
Discordian: St. Tib's Day, 3182

H:\>ddate /d 2016-02-29

St. Tib's Day, 3182

H:\>

This program assumes the date is in ISO order (yyyy-mm-dd) and has leading zeros. It also assumes the system date is similarly formatted, which is atypical on Windows machines.

Built on CMD.EXE version 5.1.2600.5512 (xpsp.080413-2111).

BBC BASIC

Works with: BBC BASIC for Windows

<lang bbcbasic> INSTALL @lib$+"DATELIB"

     PRINT "01/01/2011 -> " FNdiscordian("01/01/2011")
     PRINT "05/01/2011 -> " FNdiscordian("05/01/2011")
     PRINT "28/02/2011 -> " FNdiscordian("28/02/2011")
     PRINT "01/03/2011 -> " FNdiscordian("01/03/2011")
     PRINT "22/07/2011 -> " FNdiscordian("22/07/2011")
     PRINT "31/12/2011 -> " FNdiscordian("31/12/2011")
     
     PRINT "01/01/2012 -> " FNdiscordian("01/01/2012")
     PRINT "05/01/2012 -> " FNdiscordian("05/01/2012")
     PRINT "28/02/2012 -> " FNdiscordian("28/02/2012")
     PRINT "29/02/2012 -> " FNdiscordian("29/02/2012")
     PRINT "01/03/2012 -> " FNdiscordian("01/03/2012")
     PRINT "22/07/2012 -> " FNdiscordian("22/07/2012")
     PRINT "31/12/2012 -> " FNdiscordian("31/12/2012")
     END
     
     DEF FNdiscordian(date$)
     LOCAL Season$(), Weekday$(), mjd%, year%, day%
     DIM Season$(4), Weekday$(4)
     Season$() =  "Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"
     Weekday$() = "Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange"
     
     mjd% = FN_readdate(date$, "dmy", 2000)
     year% = FN_year(mjd%)
     
     IF FN_month(mjd%)=2 AND FN_day(mjd%)=29 THEN
       = "St. Tib's Day, YOLD " + STR$(year% + 1166)
     ENDIF
     
     IF FN_month(mjd%) < 3 THEN
       day% = mjd% - FN_mjd(1, 1, year%)
     ELSE
       day% = mjd% - FN_mjd(1, 3, year%) + 59
     ENDIF
     = Weekday$(day% MOD 5) + ", " + STR$(day% MOD 73 + 1) + " " + \
     \ Season$(day% DIV 73) + ", YOLD " + STR$(year% + 1166)</lang>

Output:

01/01/2011 -> Sweetmorn, 1 Chaos, YOLD 3177
05/01/2011 -> Setting Orange, 5 Chaos, YOLD 3177
28/02/2011 -> Prickle-Prickle, 59 Chaos, YOLD 3177
01/03/2011 -> Setting Orange, 60 Chaos, YOLD 3177
22/07/2011 -> Pungenday, 57 Confusion, YOLD 3177
31/12/2011 -> Setting Orange, 73 The Aftermath, YOLD 3177
01/01/2012 -> Sweetmorn, 1 Chaos, YOLD 3178
05/01/2012 -> Setting Orange, 5 Chaos, YOLD 3178
28/02/2012 -> Prickle-Prickle, 59 Chaos, YOLD 3178
29/02/2012 -> St. Tib's Day, YOLD 3178
01/03/2012 -> Setting Orange, 60 Chaos, YOLD 3178
22/07/2012 -> Pungenday, 57 Confusion, YOLD 3178
31/12/2012 -> Setting Orange, 73 The Aftermath, YOLD 3178

Befunge

Reads the date to convert from stdin as three separate numeric inputs (year, month, and day).

<lang befunge>0" :raeY">:#,_&>\" :htnoM">:#,_&>04p" :yaD">:#,_$&>55+,1-:47*v v"f I".+1%,,,,"Day I":$_:#<0#!4#:p#-4#1g4-#0+#<<_v#!*!-2g40!-< >"o",,,/:5+*66++:4>g#<:#44#:9#+*#1-#,_$$0 v_v#!< >$ 0 "yaD " v @,+55.+*+92"j"$_,#!>#:<", in the YOLD"*84 <.>,:^ :"St. Tib's"< $# #"#"##"#"Chaos$Discord$Confusion$Bureaucracy$The Aftermath$</lang>

Output:

(multiple runs)

Year: 2015
Month: 10
Day: 19

Day 73 of Bureaucracy, in the YOLD 3181

Year: 2012
Month: 2
Day: 29

St. Tib's Day, in the YOLD 3178

Year: 2010
Month: 7
Day: 22

Day 57 of Confusion, in the YOLD 3176

C

For the source code of ddate in util-linux package, see [[1]].

<lang C>#include <stdlib.h>

include <stdio.h>
include <time.h>

define day_of_week( x ) ((x) == 1 ? "Sweetmorn" :\

                         (x) == 2 ? "Boomtime" :\
                         (x) == 3 ? "Pungenday" :\
                         (x) == 4 ? "Prickle-Prickle" :\
                         "Setting Orange")

define season( x ) ((x) == 0 ? "Chaos" :\

                   (x) == 1 ? "Discord" :\
                   (x) == 2 ? "Confusion" :\
                   (x) == 3 ? "Bureaucracy" :\
                   "The Aftermath")

define date( x ) ((x)%73 == 0 ? 73 : (x)%73)

define leap_year( x ) ((x) % 400 == 0 || (((x) % 4) == 0 && (x) % 100))

char * ddate( int y, int d ){

 int dyear = 1166 + y;
 char * result = malloc( 100 * sizeof( char ) );

 if( leap_year( y ) ){
   if( d == 60 ){
     sprintf( result, "St. Tib's Day, YOLD %d", dyear );
     return result;
   } else if( d >= 60 ){
     -- d;
   }
 }

 sprintf( result, "%s, %s %d, YOLD %d",
          day_of_week(d%5), season(((d%73)==0?d-1:d)/73 ), date( d ), dyear );

 return result;

}

int day_of_year( int y, int m, int d ){

 int month_lengths[ 12 ] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

 for( ; m > 1; m -- ){
   d += month_lengths[ m - 2 ];
   if( m == 3 && leap_year( y ) ){
     ++ d;
   }
 }
 return d;

}

int main( int argc, char * argv[] ){

 time_t now;
 struct tm * now_time;
 int year, doy;

 if( argc == 1 ){
   now = time( NULL );
   now_time = localtime( &now );
   year = now_time->tm_year + 1900; doy = now_time->tm_yday + 1;
 } else if( argc == 4 ){
   year = atoi( argv[ 1 ] ); doy = day_of_year( atoi( argv[ 1 ] ), atoi( argv[ 2 ] ), atoi( argv[ 3 ] ) );
 }

 char * result = ddate( year, doy );
 puts( result );
 free( result );

 return 0;

}</lang>

Demonstration:

$ ./ddate 2015 10 19
Boomtime, Bureaucracy 73, YOLD 3181
$ ./ddate 7 1 2011
Sweetmorn, The Aftermath 40, YOLD 1173
$ ./ddate 2011 1 7
Boomtime, Chaos 7, YOLD 3177
$ ./ddate 2012 2 28
Prickle-Prickle, Chaos 59, YOLD 3178
$ ./ddate 2012 2 29
St. Tib's Day, YOLD 3178
$ ./ddate 2012 3 1
Setting Orange, Chaos 60, YOLD 3178
$ ./ddate 2010 7 22
Pungenday, Confusion 57, YOLD 3176
$ ./ddate # today is Jan 4, 2016
Prickle-Prickle, Chaos 4, YOLD 3182

C#

<lang csharp>using System;

public static class DiscordianDate {

   static readonly string[] seasons = { "Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath" };
   static readonly string[] weekdays = { "Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange" };
   static readonly string[] apostles = { "Mungday", "Mojoday", "Syaday", "Zaraday", "Maladay" };
   static readonly string[] holidays = { "Chaoflux", "Discoflux", "Confuflux", "Bureflux", "Afflux" };
   
   public static string Discordian(this DateTime date) {
       string yold = $" in the YOLD {date.Year + 1166}.";
       int dayOfYear = date.DayOfYear;

       if (DateTime.IsLeapYear(date.Year)) {
           if (dayOfYear == 60) return "St. Tib's day" + yold;
           else if (dayOfYear > 60) dayOfYear--;
       }
       dayOfYear--;

       int seasonDay = dayOfYear % 73 + 1;
       int seasonNr = dayOfYear / 73;
       int weekdayNr = dayOfYear % 5;
       string holyday = "";

       if (seasonDay == 5)       holyday = $" Celebrate {apostles[seasonNr]}!";
       else if (seasonDay == 50) holyday = $" Celebrate {holidays[seasonNr]}!";
       return $"{weekdays[weekdayNr]}, day {seasonDay} of {seasons[seasonNr]}{yold}{holyday}";
   }

   public static void Main() {
       foreach (var (day, month, year) in new [] {
           (1, 1, 2010),
           (5, 1, 2010),
           (19, 2, 2011),
           (28, 2, 2012),
           (29, 2, 2012),
           (1, 3, 2012),
           (19, 3, 2013),
           (3, 5, 2014),
           (31, 5, 2015),
           (22, 6, 2016),
           (15, 7, 2016),
           (12, 8, 2017),
           (19, 9, 2018),
           (26, 9, 2018),
           (24, 10, 2019),
           (8, 12, 2020),
           (31, 12, 2020)
       })
       {
           Console.WriteLine($"{day:00}-{month:00}-{year:00} = {new DateTime(year, month, day).Discordian()}");
       }
   }

}</lang>

Output:

01-01-2010 = Sweetmorn, day 1 of Chaos in the YOLD 3176.
05-01-2010 = Setting Orange, day 5 of Chaos in the YOLD 3176. Celebrate Mungday!
19-02-2011 = Setting Orange, day 50 of Chaos in the YOLD 3177. Celebrate Chaoflux!
28-02-2012 = Prickle-Prickle, day 59 of Chaos in the YOLD 3178.
29-02-2012 = St. Tib's day in the YOLD 3178.
01-03-2012 = Setting Orange, day 60 of Chaos in the YOLD 3178.
19-03-2013 = Pungenday, day 5 of Discord in the YOLD 3179. Celebrate Mojoday!
03-05-2014 = Pungenday, day 50 of Discord in the YOLD 3180. Celebrate Discoflux!
31-05-2015 = Sweetmorn, day 5 of Confusion in the YOLD 3181. Celebrate Syaday!
22-06-2016 = Pungenday, day 27 of Confusion in the YOLD 3182.
15-07-2016 = Sweetmorn, day 50 of Confusion in the YOLD 3182. Celebrate Confuflux!
12-08-2017 = Prickle-Prickle, day 5 of Bureaucracy in the YOLD 3183. Celebrate Zaraday!
19-09-2018 = Boomtime, day 43 of Bureaucracy in the YOLD 3184.
26-09-2018 = Prickle-Prickle, day 50 of Bureaucracy in the YOLD 3184. Celebrate Bureflux!
24-10-2019 = Boomtime, day 5 of The Aftermath in the YOLD 3185. Celebrate Maladay!
08-12-2020 = Boomtime, day 50 of The Aftermath in the YOLD 3186. Celebrate Afflux!
31-12-2020 = Setting Orange, day 73 of The Aftermath in the YOLD 3186.

C++

include <iostream>
include <algorithm>
include <vector>
include <sstream>
include <iterator>

using namespace std; class myTuple { public:

   void set( int a, int b, string c ) { t.first.first = a; t.first.second = b; t.second = c; }
   bool operator == ( pair<int, int> p ) { return p.first == t.first.first && p.second == t.first.second; }
   string second() { return t.second; }

private:

   pair<pair<int, int>, string> t;

}; class discordian { public:

   discordian() {
       myTuple t;
       t.set( 5, 1, "Mungday" ); holyday.push_back( t ); t.set( 19, 2, "Chaoflux" ); holyday.push_back( t );
       t.set( 29, 2, "St. Tib's Day" ); holyday.push_back( t ); t.set( 19, 3, "Mojoday" ); holyday.push_back( t );
       t.set( 3, 5, "Discoflux" ); holyday.push_back( t ); t.set( 31, 5, "Syaday" ); holyday.push_back( t );
       t.set( 15, 7, "Confuflux" ); holyday.push_back( t ); t.set( 12, 8, "Zaraday" ); holyday.push_back( t ); 
       t.set( 26, 9, "Bureflux" ); holyday.push_back( t ); t.set( 24, 10, "Maladay" ); holyday.push_back( t ); 
       t.set( 8, 12, "Afflux" ); holyday.push_back( t ); 
       seasons.push_back( "Chaos" ); seasons.push_back( "Discord" ); seasons.push_back( "Confusion" ); 
       seasons.push_back( "Bureaucracy" ); seasons.push_back( "The Aftermath" );
       wdays.push_back( "Setting Orange" ); wdays.push_back( "Sweetmorn" ); wdays.push_back( "Boomtime" );
       wdays.push_back( "Pungenday" ); wdays.push_back( "Prickle-Prickle" ); 
   }
   void convert( int d, int m, int y ) {
       if( d == 0 || m == 0 || m > 12 || d > getMaxDay( m, y ) ) { 
           cout << "\nThis is not a date!"; 
           return; 
       }
       vector<myTuple>::iterator f = find( holyday.begin(), holyday.end(), make_pair( d, m ) ); 
       int dd = d, day, wday, sea,  yr = y + 1166;
       for( int x = 1; x < m; x++ )
           dd += getMaxDay( x, 1 );
       day = dd % 73; if( !day ) day = 73; 
       wday = dd % 5; 
       sea  = ( dd - 1 ) / 73;
       if( d == 29 && m == 2 && isLeap( y ) ) { 
           cout << ( *f ).second() << " " << seasons[sea] << ", Year of Our Lady of Discord " << yr; 
           return; 
       }
       cout << wdays[wday] << " " << seasons[sea] << " " << day;
       if( day > 10 && day < 14 ) cout << "th"; 
       else switch( day % 10) { 
           case 1: cout << "st"; break; 
           case 2: cout << "nd"; break; 
           case 3: cout << "rd"; break; 
           default: cout << "th"; 
       }
       cout << ", Year of Our Lady of Discord " << yr;
       if( f != holyday.end() ) cout << " - " << ( *f ).second();
   }

private:

   int getMaxDay( int m, int y ) { 
       int dd[] = { 0, 31, isLeap( y ) ? 29 : 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; return dd[m]; 
   }
   bool isLeap( int y ) { 
       bool l = false; 
       if( !( y % 4 ) ) { 
           if( y % 100 ) l = true; 
           else if( !( y % 400 ) ) l = true; 
       }
       return l; 
   }
   vector<myTuple> holyday; vector<string> seasons, wdays;

}; int main( int argc, char* argv[] ) {

   string date; discordian disc;
   while( true ) {
       cout << "Enter a date (dd mm yyyy) or 0 to quit: "; getline( cin, date ); if( date == "0" ) break;
       if( date.length() == 10 ) {
           istringstream iss( date ); 
           vector<string> vc;
           copy( istream_iterator<string>( iss ), istream_iterator<string>(), back_inserter<vector<string> >( vc ) );
           disc.convert( atoi( vc[0].c_str() ), atoi( vc[1].c_str() ), atoi( vc[2].c_str() ) ); 
           cout << "\n\n\n";
       } else cout << "\nIs this a date?!\n\n";
   }
   return 0;

} </lang>

Output:

Enter a date (dd mm yyyy) or 0 to quit: 19 10 2015 Boomtime, Bureaucracy 73rd, Year of Our Lady of Discord 3181

Enter a date (dd mm yyyy) or 0 to quit: 08 06 2015 Prickle-Prickle, Confusion 13th, Year of Our Lady of Discord 3181

Enter a date (dd mm yyyy) or 0 to quit: 23 06 2015 Prickle-Prickle, Confusion 28th, Year of Our Lady of Discord 3181

Enter a date (dd mm yyyy) or 0 to quit: 29 02 2016 St. Tib's Day, Year of Our Lady of Discord 3182

Enter a date (dd mm yyyy) or 0 to quit: 05 01 2016 Setting Orange, Chaos 5th, Year of Our Lady of Discord 3182 - Mungday

Enter a date (dd mm yyyy) or 0 to quit: 26 08 2016 Pungenday, Bureaucracy 19th, Year of Our Lady of Discord 3182

Clojure

<lang clojure>(require '[clj-time.core :as tc])

(def seasons ["Chaos" "Discord" "Confusion" "Bureaucracy" "The Aftermath"]) (def weekdays ["Sweetmorn" "Boomtime" "Pungenday" "Prickle-Prickle" "Setting Orange"]) (def year-offset 1166)

(defn leap-year? [year]

 (= 29 (tc/number-of-days-in-the-month year 2)))

(defn discordian-day [day leap]

 (let [offset (if (and leap (>= day 59)) 1 0)
       day-off (- day offset)
       day-num (inc (rem day-off 73))
       season (seasons (quot day-off 73))
       weekday (weekdays (mod day-off 5))]
   (if (and (= day 59) (= offset 1))
     "St. Tib's Day"
     (str weekday ", " season " " day-num))))

(defn discordian-date [year month day]

 (let [day-of-year (dec (.getDayOfYear (tc/date-time year month day)))
       dday (discordian-day day-of-year (leap-year? year))]
   (format "%s, YOLD %s" dday (+ year year-offset))))</lang>

Output:

user=> (discordian-date 2010 7 22)
"Pungenday, Confusion 57, YOLD 3176"
user=> (discordian-date 2012 2 28)
"Prickle-Prickle, Chaos 59, YOLD 3178"
user=> (discordian-date 2012 2 29)
"St. Tib's Day, YOLD 3178"
user=> (discordian-date 2012 3 1)
"Setting Orange, Chaos 60, YOLD 3178"
user=> (discordian-date 2012 12 31)
"Setting Orange, The Aftermath 73, YOLD 3178"
user=> (discordian-date 2013 12 31)
"Setting Orange, The Aftermath 73, YOLD 3179"

CLU

<lang clu>% This program needs to be merged with PCLU's "useful.lib", % so it can use get_argv to read the command line. % % pclu -merge $CLUHOME/lib/useful.lib -compile cmdline.clu

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % Represent a day in the Discordian calendar % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% eris_date = cluster is from_greg_y_m_d,

                      from_date,
                      get_year,
                      get_day,
                      get_season,
                      get_weekday,
                      get_day_name,
                      get_holyday,
                      get_format
   greyface = 1166 
   
   % A Discordian day is either St. Tib's day
   % or a day in a season
   season_day = struct[season, day: int] 
   eris_day = oneof[st_tibs: null, season_day: season_day]
   
   % A Discordian date is a day in a year
   rep = struct[year: int, day: eris_day]
   
   % Offset of each Gregorian month in a non-leap year
   own month_offset: sequence[int] := sequence[int]$[
       0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
   ]
   
   % Length of each Gregorian month in a non-leap year
   own month_length: sequence[int] := sequence[int]$[
       31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
   ]
   
   own week_days: sequence[string] := sequence[string]$[
       "Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle",
       "Setting Orange"
   ]
   
   own seasons: sequence[string] := sequence[string]$[
       "Chaos", "Discord", "Confusion", "Bureacuracy",
       "The Aftermath"
   ]
   
   own apostle_holydays: sequence[string] := sequence[string]$[
       "Mungday", "Mojoday", "Syaday", "Zaraday", "Maladay"
   ]
   
   own season_holydays: sequence[string] := sequence[string]$[
       "Chaoflux", "Discoflux", "Confuflux", "Bureflux", "Afflux"
   ]
   
   % Check if a Gregorian year is a leap year
   is_leap = proc (year: int) returns (bool)
       if year // 4 ~= 0 then return(false)
       elseif year // 100 ~= 0 then return(true)
       elseif year // 400 ~= 0 then return(false)
       else return(true)
       end
   end is_leap
       
   % Convert a Gregorian date to a Discordian date
   from_greg_y_m_d = proc (year, month, day: int) 
                     returns (cvt) signals (invalid)
       % Make sure the month is valid
       if month<1 cor month>12 then signal invalid end
       
       % Saint Tib's Day?
       if month=2 cand day=29 then
           % Only valid in leap years
           if ~is_leap(year) then signal invalid end
           return(rep${year: year+greyface, day: eris_day$make_st_tibs(nil)})
       end
       
       % If not, make sure the day of the month is valid
       if day<1 cor day>month_length[month] then signal invalid end
       
       % The Discordian calendar doesn't consider Saint Tib's Day 
       % part of a season, so we can use the day number for a non-leap 
       % year even in a leap year
       year_day: int := (day + month_offset[month]) - 1
       sd: season_day := season_day${
           season: year_day / 73 + 1,
           day: year_day // 73 + 1
       }
       return(rep${year: year+greyface,
                   day: eris_day$make_season_day(sd)})
   end from_greg_y_m_d
   
   % Convert a CLU 'date' object to a Discordian date (ignoring the time)
   from_date = proc (d: date) returns (cvt) signals (invalid)
       return(down(from_greg_y_m_d(d.year, d.month, d.day)))
       resignal invalid
   end from_date
   
   % Retrieve year, season, day, weekday number
   get_year = proc (d: cvt) returns (int) return(d.year) end get_year
   
   get_day = proc (d: cvt) returns (int) signals (st_tibs)
       tagcase d.day
           tag st_tibs: signal st_tibs
           tag season_day (s: season_day): return(s.day)
       end
   end get_day
   
   get_season = proc (d: cvt) returns (int) signals (st_tibs)
       tagcase d.day
           tag st_tibs: signal st_tibs
           tag season_day (s: season_day): return(s.season)
       end
   end get_season
   
   get_weekday = proc (d: cvt) returns (int) signals (st_tibs)
       day: int := up(d).day resignal st_tibs
       season: int := up(d).season resignal st_tibs
       weekday: int := ( (season-1)*73 + (day-1) ) // 5 + 1
       return( weekday )
   end get_weekday
   
   % Retrieve formatted day in year
   get_day_name = proc (d: cvt) returns (string)
       begin
           fmt: stream := stream$create_output()
           stream$puts(fmt, week_days[up(d).weekday])
           stream$puts(fmt, ", day " || int$unparse(up(d).day))
           stream$puts(fmt, " of " || seasons[up(d).season])
           return(stream$get_contents(fmt))
       end except when st_tibs:
           return("St. Tib's Day")
       end
   end get_day_name
   
   % Retrieve holyday name if there is one
   get_holyday = proc (d: cvt) returns (string) signals (no_holyday)
       begin
           if up(d).day = 5 then return(apostle_holydays[up(d).season])
           elseif up(d).day = 50 then return(season_holydays[up(d).season])
           else signal no_holyday
           end
       end except when st_tibs:
           signal no_holyday  % St. Tib's Day is not a normal holyday
       end
   end get_holyday
   
   % Retrieve long format
   get_format = proc (d: cvt) returns (string)
       fmt: stream := stream$create_output()
       stream$puts(fmt, up(d).day_name)
       stream$puts(fmt, " in the YOLD ")
       stream$puts(fmt, int$unparse(up(d).year))
       stream$puts(fmt, ": celebrate " || up(d).holyday) except when no_holyday: end
       return(stream$get_contents(fmt))
   end get_format

end eris_date

% Parse a date string (MM/DD/YYYY) and return a date object parse_date = proc (s: string) returns (date) signals (bad_format)

   begin
       parts: array[int] := array[int]$[]
       while true do
           slash: int := string$indexc('/', s)
           if slash=0 then 
               array[int]$addh(parts, int$parse(s))
               break
           else
               array[int]$addh(parts, int$parse(string$substr(s, 1, slash-1)))
               s := string$rest(s, slash+1)
           end
       end
       if array[int]$size(parts) ~= 3 then signal bad_format end
       return(date$create(parts[2], parts[1], parts[3], 0, 0, 0))
   end resignal bad_format

end parse_date

% Read date(s) from the command line, or use the current date, % and convert to the Discordian date start_up = proc ()

   po: stream := stream$primary_output()
   args: sequence[string] := get_argv()
   dates: array[date] := array[date]$[]
   
   if sequence[string]$empty(args) then 
       % No argument - use today's date 
       stream$puts(po, "Today is ")
       array[date]$addh(dates, now())
   else 
       % There are argument(s) - parse each of them
       for arg: string in sequence[string]$elements(args) do
           array[date]$addh(dates, parse_date(arg))
       end
   end
   
   % Convert all dates
   for d: date in array[date]$elements(dates) do
       stream$putl(po, eris_date$from_date(d).format)
   end

end start_up</lang>

Output:

$ ./ddate
Today is Boomtime, day 45 of The Aftermath in the YOLD 3187

$ ./ddate 4/27/2020 9/26/1995 2/29/1996 7/22/2011 1/5/2005
Boomtime, day 44 of Discord in the YOLD 3186
Prickle-Prickle, day 50 of Bureacuracy in the YOLD 3161: celebrate Bureflux
St. Tib's Day in the YOLD 3162
Pungenday, day 57 of Confusion in the YOLD 3177
Setting Orange, day 5 of Chaos in the YOLD 3171: celebrate Mungday

D

<lang d>import std.stdio, std.datetime, std.conv, std.string;

immutable seasons = ["Chaos", "Discord", "Confusion",

                    "Bureaucracy", "The Aftermath"],
         weekday = ["Sweetmorn", "Boomtime", "Pungenday",
                    "Prickle-Prickle", "Setting Orange"],
         apostle = ["Mungday", "Mojoday", "Syaday",
                    "Zaraday", "Maladay"],
         holiday = ["Chaoflux", "Discoflux", "Confuflux",
                    "Bureflux", "Afflux"];

string discordianDate(in Date date) pure {

   immutable dYear = text(date.year + 1166);

   immutable isLeapYear = date.isLeapYear;
   if (isLeapYear && date.month == 2 && date.day == 29)
       return "St. Tib's Day, in the YOLD " ~ dYear;

   immutable doy = (isLeapYear && date.dayOfYear >= 60) ?
                   date.dayOfYear - 1 :
                   date.dayOfYear;

   immutable dsDay = (doy % 73)==0? 73:(doy % 73); // Season day.
   if (dsDay == 5)
       return apostle[doy / 73] ~ ", in the YOLD " ~ dYear;
   if (dsDay == 50)
       return holiday[doy / 73] ~ ", in the YOLD " ~ dYear;

   immutable dSeas = seasons[(((doy%73)==0)?doy-1:doy) / 73];
   immutable dWday = weekday[(doy - 1) % 5];

   return format("%s, day %s of %s in the YOLD %s",
                 dWday, dsDay, dSeas, dYear);

}

unittest {

   assert(Date(2010, 7, 22).discordianDate ==
          "Pungenday, day 57 of Confusion in the YOLD 3176");
   assert(Date(2012, 2, 28).discordianDate ==
          "Prickle-Prickle, day 59 of Chaos in the YOLD 3178");
   assert(Date(2012, 2, 29).discordianDate ==
          "St. Tib's Day, in the YOLD 3178");
   assert(Date(2012, 3, 1).discordianDate ==
          "Setting Orange, day 60 of Chaos in the YOLD 3178");
   assert(Date(2010, 1, 5).discordianDate ==
          "Mungday, in the YOLD 3176");
   assert(Date(2011, 5, 3).discordianDate ==
          "Discoflux, in the YOLD 3177");

}

void main(string args[]) {

   int yyyymmdd, day, mon, year, sign;
   if (args.length == 1) {
      (cast(Date)Clock.currTime).discordianDate.writeln;
      return;
   }
   foreach (i, arg; args) {
       if (i > 0) {
           //writef("%d: %s: ", i, arg);
           yyyymmdd = to!int(arg);
           if (yyyymmdd < 0) {
               sign = -1;
               yyyymmdd = -yyyymmdd;
           }
           else {
               sign = 1;
           }
           day = yyyymmdd % 100;
           if (day == 0) {
              day = 1;
           }
           mon = ((yyyymmdd - day) / 100) % 100;
           if (mon == 0) {
              mon = 1;
           }
           year = sign * ((yyyymmdd - day - 100*mon) / 10000);
           writefln("%s", Date(year, mon, day).discordianDate);
       }
   }

}</lang>

Output:

$ ./ddate 20100722 20120228 20120229 20120301 20100105 20110503 20151019 00000101 -11660101
Pungenday, day 57 of Confusion in the YOLD 3176
Prickle-Prickle, day 59 of Chaos in the YOLD 3178
St. Tib's Day, in the YOLD 3178
Setting Orange, day 60 of Chaos in the YOLD 3178
Mungday, in the YOLD 3176
Discoflux, in the YOLD 3177
Boomtime, day 73 of Bureaucracy in the YOLD 3181
Sweetmorn, day 1 of Chaos in the YOLD 1166
Sweetmorn, day 1 of Chaos in the YOLD 0

Delphi

Library: System.SysUtils

Library: System.DateUtils

Translation of: D

Partial translation of D.

<lang Delphi> program Discordian_date;

{$APPTYPE CONSOLE}

uses

 System.SysUtils,
 System.DateUtils;

type

 TDateTimeHelper = record helper for TDateTime
   const
     seasons: array of string = ['Chaos', 'Discord', 'Confusion', 'Bureaucracy',
       'The Aftermath'];
     weekday: array of string = ['Sweetmorn', 'Boomtime', 'Pungenday',
       'Prickle-Prickle', 'Setting Orange'];
     apostle: array of string = ['Mungday', 'Mojoday', 'Syaday', 'Zaraday', 'Maladay'];
     holiday: array of string = ['Chaoflux', 'Discoflux', 'Confuflux',
       'Bureflux', 'Afflux'];
   function DiscordianDate(): string;
 end;

{ TDateTimeHelper }

function TDateTimeHelper.DiscordianDate: string; var

 isLeapYear: boolean;

begin

 isLeapYear := IsInLeapYear(self);
 var dYear := (YearOf(self) + 1166).ToString;
 if isLeapYear and (MonthOf(self) = 2) and (dayof(self) = 29) then
   exit('St. Tibs Day, in the YOLD ' + dYear);

 var doy := DayOfTheYear(self);
 if isLeapYear and (doy >= 60) then
   doy := doy - 1;

 var dsDay := doy mod 73;

 if dsDay = 0 then
   dsDay := 73;

 if dsDay = 5 then
   exit(apostle[doy div 73] + ', in the YOLD ' + dYear);

 if dsDay = 50 then
   exit(holiday[doy div 73] + ', in the YOLD ' + dYear);

 var dSeas: string;

 if (doy mod 73) = 0 then
   dSeas := seasons[(doy - 1) div 73]
 else
   dSeas := seasons[doy div 73];

 var dWday := weekday[(doy - 1) mod 5];

 Result := format('%s, day %d of %s in the YOLD %s', [dWday, dsDay, dSeas, dYear]);

end;

procedure Test(); begin

 Assert(EncodeDate(2010, 7, 22).DiscordianDate =
   'Pungenday, day 57 of Confusion in the YOLD 3176');
 Assert(EncodeDate(2012, 2, 28).DiscordianDate =
   'Prickle-Prickle, day 59 of Chaos in the YOLD 3178');
 Assert(EncodeDate(2012, 2, 29).DiscordianDate = 'St. Tibs Day, in the YOLD 3178');
 Assert(EncodeDate(2012, 3, 1).DiscordianDate =
   'Setting Orange, day 60 of Chaos in the YOLD 3178');
 Assert(EncodeDate(2010, 1, 5).DiscordianDate = 'Mungday, in the YOLD 3176');
 Assert(EncodeDate(2011, 5, 3).DiscordianDate = 'Discoflux, in the YOLD 3177');
 writeln('OK');

end;

var

 dt: TDateTime;
 i: Integer;

begin

 if ParamCount = 0 then
 begin
   writeln(now.DiscordianDate);
   readln;
   halt;
 end;

 for i := 1 to ParamCount do
 begin
   if not TryStrToDate(ParamStr(i), dt) then
     Continue;
   writeln(dt.DiscordianDate);
 end;

 readln;

end.</lang>

Euphoria

Translation of: D

<lang euphoria>function isLeapYear(integer year)

   return remainder(year,4)=0 and remainder(year,100)!=0 or remainder(year,400)=0

end function

constant YEAR = 1, MONTH = 2, DAY = 3, DAY_OF_YEAR = 8

constant month_lengths = {31,28,31,30,31,30,31,31,30,31,30,31} function dayOfYear(sequence Date)

   integer d
   if length(Date) = DAY_OF_YEAR then
       d = Date[DAY_OF_YEAR]
   else
       d = Date[DAY]
       for i = Date[MONTH]-1 to 1 by -1 do
           d += month_lengths[i]
           if i = 2 and isLeapYear(Date[YEAR]) then
               d += 1
           end if
       end for
   end if
   return d

end function

constant seasons = {"Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"} constant weekday = {"Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange"} constant apostle = {"Mungday", "Mojoday", "Syaday", "Zaraday", "Maladay"} constant holiday = {"Chaoflux", "Discoflux", "Confuflux", "Bureflux", "Afflux"}

function discordianDate(sequence Date)

   sequence dyear, dseas, dwday
   integer  leap, doy, dsday
   dyear = sprintf("%d",Date[YEAR]+1166)
   leap = isLeapYear(Date[YEAR])
   if leap and Date[MONTH] = 2 and Date[DAY] = 29 then
       return "St. Tib's Day, in the YOLD " & dyear
   end if
   
   doy = dayOfYear(Date)
   if leap and doy >= 60 then
       doy -= 1
   end if
   
   dsday = remainder(doy,73)
   if dsday = 5 then
       return apostle[doy/73+1] & ", in the YOLD " & dyear
   elsif dsday = 50 then
       return holiday[doy/73+1] & ", in the YOLD " & dyear
   end if
   
   dseas = seasons[doy/73+1]
   dwday = weekday[remainder(doy-1,5)+1]
   
   return sprintf("%s, day %d of %s in the YOLD %s", {dwday, dsday, dseas, dyear})

end function

sequence today today = date() today[YEAR] += 1900 puts(1, discordianDate(today))</lang>

F#

<lang fsharp>open System

let seasons = [| "Chaos"; "Discord"; "Confusion"; "Bureaucracy"; "The Aftermath" |]

let ddate (date:DateTime) =

   let dyear = date.Year + 1166
   let leapYear = DateTime.IsLeapYear(date.Year)
   
   if leapYear && date.Month = 2 && date.Day = 29 then
       sprintf "St. Tib's Day, %i YOLD" dyear
   else
       // compensate for St. Tib's Day
       let dayOfYear = (if leapYear && date.DayOfYear >= 60 then date.DayOfYear - 1 else date.DayOfYear) - 1
       let season, dday = Math.DivRem(dayOfYear, 73)
       sprintf "%s %i, %i YOLD" seasons.[season] (dday+1) dyear

[<EntryPoint>] let main argv =

   let p = Int32.Parse
   Seq.ofArray("2012-02-28 2012-02-29 2012-03-01 2010-07-22 2015-10-19 2015-10-20".Split())
   |> Seq.map(fun (s:string) ->
       let d = s.Split('-')
       (s, DateTime(p(d.[0]),p(d.[1]),p(d.[2]))))
   |> Seq.iter(fun (s,d) -> printfn "%s is %s" s (ddate d))
   0

</lang>

Output:

2012-02-28 is Chaos 59, 3178 YOLD
2012-02-29 is St. Tib's Day, 3178 YOLD
2012-03-01 is Chaos 60, 3178 YOLD
2010-07-22 is Confusion 57, 3176 YOLD
2015-10-19 is Bureaucracy 73, 3181 YOLD
2015-10-20 is The Aftermath 1, 3181 YOLD

Fortran

<lang FORTRAN> program discordianDate

   implicit none
   ! Declare variables
   character(32) :: arg
   character(15) :: season,day,holyday
   character(80) :: Output,fmt1,fmt2,fmt3
   character(2) :: dayfix,f1,f2,f3,f4
   integer :: i,j,k,daysofyear,dayofweek,seasonnum,yold,dayofseason,t1,t2,t3
   integer,dimension(8) :: values
   integer, dimension(12) :: daysinmonth
   logical  :: isleapyear, isholyday, Pleapyear
    
   ! Get the current date
   call date_and_time(VALUES=values)
   ! Set some values up to defaults
   daysinmonth = (/ 31,28,31,30,31,30,31,31,30,31,30,31 /)
   isleapyear = .false.
   isholyday = .false.
   ! process any command line arguments
   ! using arguments dd mm yyyy 
   j = iargc()
   do i = 1, iargc()
     call getarg(i, arg)  ! fetches argument as a character string
     if (j==3) then
       if (i==1) then
         read(arg,'(i2)') values(3)  ! convert to integer
       endif
       if (i==2) then
         read(arg,'(i2)') values(2)  ! convert to integer
       endif
       if (i==3) then
         read(arg,'(i4)') values(1)  ! convert to integer

       endif
     endif
     if (j==2) then  ! arguments dd mm
       if (i==1) then
         read(arg,'(i2)') values(3)  ! convert to integer
       endif
       if (i==2) then
         read(arg,'(i2)') values(2)  ! convert to integer
       endif
     endif
     if (j==1) then ! argument dd
       read(arg,'(i2)') values(3)  ! convert to integer
     endif
   end do

   !Start the number crunching here

   yold = values(1) + 1166
   daysofyear = 0
   if (values(2)>1) then 
   do i=1 , values(2)-1 , 1
       daysofyear = daysofyear + daysinmonth(i)
    end do
  end if
   daysofyear = daysofyear + values(3)
   isholyday = .false.
   isleapyear = Pleapyear(yold)
   dayofweek = mod (daysofyear, 5)
   seasonnum = ((daysofyear - 1) / 73) + 1 
   dayofseason = daysofyear - ((seasonnum - 1)  * 73)
   k = mod(dayofseason,10)  ! just to get the day number postfix
   select case (k)
     case (1)
        dayfix='st'
     case (2)
        dayfix='nd'
     case (3)
        dayfix='rd'
     case default
        dayfix='th'
   end select
   ! except between 10th and 20th  where we always have 'th'
   if (((dayofseason > 10) .and. (dayofseason < 20)) .eqv. .true.) then
     dayfix = 'th'
   end if
   select case (Seasonnum)
     case (1) 
       season ='Choas'
       f4 = '5'
     case (2) 
       season ='Discord'
       f4 = '7'
     case (3) 
       season ='Confusion'
       f4 = '9'
     case (4) 
       season ='Bureaucracy'
       f4 = '10'
     case (5) 
       season ='The Aftermath'
       f4 = '13'
   end select
   select case (dayofweek)
      case (0) 
        day='Setting Orange'
        f2 = '14'
      case (1) 
        day ='Sweetmorn'
        f2 = '9'
      case (2) 
        day = 'Boomtime'
        f2 = '8'
      case (3) 
        day = 'Pungenday'
        f2 = '9'
      case (4) 
        day = 'Prickle-Prickle'
        f2 = '15'
   end select
   ! check for holydays
   select case (dayofseason)
     case (5)
       isholyday = .true.
       select case (seasonnum)
         case (1)
            holyday ='Mungday'
            f1 = '7'
         case (2)
            holyday = 'Mojoday'
            f1 = '7'
         case (3)
           holyday = 'Syaday'
           f1 = '6'
         case (4)
            holyday = 'Zaraday'
            f1 = '7'
         case (5)
           holyday = 'Maladay'
           f1 = '7'
        end select
     Case (50)
       isholyday = .true.
       select case (seasonnum)
         case (1)
           holyday = 'Chaoflux'
           f1 = '8'
         case (2)
           holyday = 'Discoflux'
           f1 = '9'
         case (3)
           holyday = 'Confuflux'
           f1 = '9'
         case (4)
           holyday = 'Bureflux'
           f1 = '8'
         case (5)
           holyday = 'Afflux'
           f1 = '6'
        end select
   end select

   ! Check if it is St. Tibbs day
   if (isleapyear .eqv. .true.) then 
     if ((values(2) == 2) .and. (values(3) == 29)) then
        isholyday = .true.
     end if
   end if
   ! Construct our format strings
   f3 = "2"
   if (dayofseason < 10) then
     f3 = "1"
   end if
   fmt1 = "(a,i4)"
   fmt2 = "(A,a" // f1 // ",A,A" // f2 // ",A,I" // f3 // ",A2,A,A" // f4 // ",A,I4)"
   fmt3 = "(A,A" // f2 // ",A,I" // f3 //",A2,A,A" // f4 // ",A,I4)"
   ! print an appropriate line
   if (isholyday .eqv. .true.) then
     if (values(3) == 29) then
        print fmt1,'Celebrate for today is St. Tibbs Day in the YOLD ',yold
      else
        print fmt2, 'Today is ',holyday, ' on ',day,' the ',dayofseason,dayfix,' day of ',season,' in the YOLD ',yold 
      end if
    else   ! not a holyday
        print fmt3, 'Today is ',day,' the ',dayofseason,dayfix, ' day of ',season,' in the YOLD ',yold
    end if
   end program discordianDate

   ! Function to check to see if this is a leap year returns true or false!

   function Pleapyear(dloy) result(leaper)
   implicit none
   integer, intent(in) :: dloy
   logical :: leaper
   leaper = .false.
   if (mod((dloy-1166),4) == 0)  then
     leaper = .true.
   end if
   if (mod((dloy-1166),100) == 0) then
       leaper = .false.
       if (mod((dloy-1166),400)==0) then
          leaper = .true.
       end if
   end if 
   end function Pleapyear

</lang>

compiled as ddate.
useage ./ddate
       ./ddate dd mm yyyy

Output:

./ddate
Today is Pungenday the 56th day of The Aftermath in the YOLD 3184
./ddate 29 02 2020
Celebrate for today is St. Tibbs Day in the YOLD 3186

FreeBASIC

Translation of: BASIC

<lang freebasic>#Include "datetime.bi"

meses: Data "Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath" dias_laborales: Data "Setting Orange", "Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle" dias_previos_al_1er_mes: ' ene feb mar abr may jun jul ago sep oct nov dic Data 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334

Function cJuliano(d As Double) As Integer

   'no tiene en cuenta los años bisiestos (no es necesario para ddate)
   Dim tmp As Integer, i As Integer
   Restore dias_previos_al_1er_mes
   For i = 1 To Month(d)
       Read tmp
   Next i
   Function = tmp + Day(d)

End Function

Sub cDiscordiano(Fecha As String)

   Dim As Integer dyear, dday, j, jday
   Dim As Double tempfecha = Datevalue(Fecha)
   Dim As String ddate, dseason, dweekday
   
   dyear = Year(tempfecha) + 1166
   If (2 = Month(tempfecha)) And (29 = Day(tempfecha)) Then
       ddate = "Saint Tib's Day, " & Str(dyear) & " YOLD"
   Else
       jday = cJuliano(tempfecha)
       Restore meses
       For j = 1 To ((jday - 1) \ 73) + 1
           Read dseason
       Next j
       dday = (jday Mod 73)
       If 0 = dday Then dday = 73
       Restore dias_laborales
       For j = 1 To (jday Mod 5) + 1
           Read dweekday
       Next j
       ddate = dweekday & ", " & dseason & " " & Trim(Str(dday)) & ", " & Trim(Str(dyear)) & " YOLD"
   End If
   Print Fecha & " -> " & ddate

End Sub

cDiscordiano("01/01/2020") cDiscordiano("05/01/2020") cDiscordiano("28/02/2020") cDiscordiano("01/03/2020") cDiscordiano("22/07/2020") cDiscordiano("31/12/2020") cDiscordiano("20/04/2022") cDiscordiano("24/05/2020") cDiscordiano("29/02/2020") cDiscordiano("15/07/2019") cDiscordiano("19/03/2025") Sleep</lang>

Output:

01/01/2020 -> Sweetmorn, Chaos 1, 3186 YOLD
05/01/2020 -> Setting Orange, Chaos 5, 3186 YOLD
28/02/2020 -> Prickle-Prickle, Chaos 59, 3186 YOLD
01/03/2020 -> Setting Orange, Chaos 60, 3186 YOLD
22/07/2020 -> Pungenday, Confusion 57, 3186 YOLD
31/12/2020 -> Setting Orange, The Aftermath 73, 3186 YOLD
20/04/2022 -> Setting Orange, Discord 37, 3188 YOLD
24/05/2020 -> Prickle-Prickle, Discord 71, 3186 YOLD
29/02/2020 -> Saint Tib's Day, 3186 YOLD
15/07/2019 -> Sweetmorn, Confusion 50, 3185 YOLD
19/03/2025 -> Pungenday, Discord 5, 3191 YOLD

Go

A package modeled after the time package in the Go standard library <lang go>package ddate

import (

   "strconv"
   "strings" 
   "time"

)

// Predefined formats for DiscDate.Format const (

   DefaultFmt = "Pungenday, Discord 5, 3131 YOLD"
   OldFmt     = `Today is Pungenday, the 5th day of Discord in the YOLD 3131

Celebrate Mojoday` )

// Formats passed to DiscDate.Format are protypes for formated dates. // Format replaces occurrences of prototype elements (the constant strings // listed here) with values corresponding to the date being formatted. // If the date is St. Tib's Day, the string from the first date element // through the last is replaced with "St. Tib's Day". const (

   protoLongSeason  = "Discord"
   protoShortSeason = "Dsc"
   protoLongDay     = "Pungenday"
   protoShortDay    = "PD"
   protoOrdDay      = "5"
   protoCardDay     = "5th"
   protoHolyday     = "Mojoday"
   protoYear        = "3131"

)

var (

   longDay = []string{"Sweetmorn", "Boomtime", "Pungenday",
       "Prickle-Prickle", "Setting Orange"}
   shortDay   = []string{"SM", "BT", "PD", "PP", "SO"}
   longSeason = []string{
       "Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"}
   shortSeason = []string{"Chs", "Dsc", "Cfn", "Bcy", "Afm"}
   holyday     = [][]string{{"Mungday", "Chaoflux"}, {"Mojoday", "Discoflux"},
       {"Syaday", "Confuflux"}, {"Zaraday", "Bureflux"}, {"Maladay", "Afflux"}}

)

type DiscDate struct {

   StTibs bool
   Dayy   int // zero based day of year, meaningless if StTibs is true
   Year   int // gregorian + 1166

}

func New(eris time.Time) DiscDate {

   t := time.Date(eris.Year(), 1, 1, eris.Hour(), eris.Minute(),
       eris.Second(), eris.Nanosecond(), eris.Location())
   bob := int(eris.Sub(t).Hours()) / 24
   raw := eris.Year()
   hastur := DiscDate{Year: raw + 1166}
   if raw%4 == 0 && (raw%100 != 0 || raw%400 == 0) {
       if bob > 59 {
           bob--
       } else if bob == 59 {
           hastur.StTibs = true
           return hastur
       }
   }
   hastur.Dayy = bob
   return hastur

}

func (dd DiscDate) Format(f string) (r string) {

   var st, snarf string
   var dateElement bool
   f6 := func(proto, wibble string) {
       if !dateElement {
           snarf = r
           dateElement = true
       }
       if st > "" {
           r = ""
       } else {
           r += wibble
       }
       f = f[len(proto):]
   }
   f4 := func(proto, wibble string) {
       if dd.StTibs {
           st = "St. Tib's Day"
       }
       f6(proto, wibble)
   }
   season, day := dd.Dayy/73, dd.Dayy%73
   for f > "" {
       switch {
       case strings.HasPrefix(f, protoLongDay):
           f4(protoLongDay, longDay[dd.Dayy%5])
       case strings.HasPrefix(f, protoShortDay):
           f4(protoShortDay, shortDay[dd.Dayy%5])
       case strings.HasPrefix(f, protoCardDay):
           funkychickens := "th"
           if day/10 != 1 {
               switch day % 10 {
               case 0:
                   funkychickens = "st"
               case 1:
                   funkychickens = "nd"
               case 2:
                   funkychickens = "rd"
               }
           }
           f4(protoCardDay, strconv.Itoa(day+1)+funkychickens)
       case strings.HasPrefix(f, protoOrdDay):
           f4(protoOrdDay, strconv.Itoa(day+1))
       case strings.HasPrefix(f, protoLongSeason):
           f6(protoLongSeason, longSeason[season])
       case strings.HasPrefix(f, protoShortSeason):
           f6(protoShortSeason, shortSeason[season])
       case strings.HasPrefix(f, protoHolyday):
           if day == 4 {
               r += holyday[season][0]
           } else if day == 49 {
               r += holyday[season][1]
           }
           f = f[len(protoHolyday):]
       case strings.HasPrefix(f, protoYear):
           r += strconv.Itoa(dd.Year)
           f = f[4:]
       default:
           r += f[:1]
           f = f[1:]
       }
   }
   if st > "" { 
       r = snarf + st + r
   }
   return

} </lang> Example program using above package <lang go>package main

import (

   "ddate"
   "fmt"
   "os"
   "strings"
   "time"

)

func main() {

   pi := 1
   fnord := ddate.DefaultFmt
   if len(os.Args) > 1 {
       switch os.Args[1][0] {
       case '+':
           pi++
           fnord = os.Args[1][1:]
       case '-':
           usage()
       }
   }
   var eris time.Time
   switch len(os.Args) - pi {
   case 0:
       eris = time.Now()
   case 3:
       var err error
       eris, err = time.Parse("2 1 2006", strings.Join(os.Args[pi:pi+3], " "))
       if err != nil {
           fmt.Println(err)
           usage()
       }
   default:
       usage()
   }
   fmt.Println(ddate.New(eris).Format(fnord))

}

func usage() {

   fmt.Fprintf(os.Stderr, "usage: %s [+format] [day month year]\n", os.Args[0])
   os.Exit(1)

}</lang>

Output:

> ddate
Pungenday, Confusion 62, 3177 YOLD

> ddate 29 2 2012
St. Tib's Day, 3178 YOLD

Haskell

<lang haskell>import Data.Time (isLeapYear) import Data.Time.Calendar.MonthDay (monthAndDayToDayOfYear) import Text.Printf (printf)

type Year = Integer type Day = Int type Month = Int

data DDate = DDate Weekday Season Day Year

          | StTibsDay Year deriving (Eq, Ord)

data Season = Chaos

           | Discord
           | Confusion
           | Bureaucracy
           | TheAftermath
           deriving (Show, Enum, Eq, Ord, Bounded)

data Weekday = Sweetmorn

            | Boomtime
            | Pungenday
            | PricklePrickle
            | SettingOrange
            deriving (Show, Enum, Eq, Ord, Bounded)

instance Show DDate where

 show (StTibsDay y) = printf "St. Tib's Day, %d YOLD" y
 show (DDate w s d y) = printf "%s, %s %d, %d YOLD" (show w) (show s) d y

fromYMD :: (Year, Month, Day) -> DDate fromYMD (y, m, d)

 | leap && dayOfYear == 59 = StTibsDay yold
 | leap && dayOfYear >= 60 = mkDDate $ dayOfYear - 1 
 | otherwise               = mkDDate dayOfYear
 where
   yold = y + 1166
   dayOfYear = monthAndDayToDayOfYear leap m d - 1
   leap = isLeapYear y

   mkDDate dayOfYear = DDate weekday season dayOfSeason yold
     where
       weekday = toEnum $ dayOfYear `mod` 5
       season = toEnum $ dayOfYear `div` 73
       dayOfSeason = 1 + dayOfYear `mod` 73</lang>

Examples:

<lang haskell>test = mapM_ display dates

 where
   display d = putStr (show d ++ " -> ") >> print (fromYMD d)
   dates = [(2012,2,28)
           ,(2012,2,29)
           ,(2012,3,1)
           ,(2012,3,14)
           ,(2012,3,15)
           ,(2010,9,2)
           ,(2010,12,31)
           ,(2011,1,1)]</lang>

λ> test
(2012,2,28) -> PricklePrickle, Chaos 59, 3178 YOLD
(2012,2,29) -> St. Tib's Day, 3178 YOLD
(2012,3,1) -> SettingOrange, Chaos 60, 3178 YOLD
(2012,3,14) -> Pungenday, Chaos 73, 3178 YOLD
(2012,3,15) -> PricklePrickle, Discord 1, 3178 YOLD
(2010,9,2) -> SettingOrange, Bureaucracy 26, 3176 YOLD
(2010,12,31) -> SettingOrange, TheAftermath 73, 3176 YOLD
(2011,1,1) -> Sweetmorn, Chaos 1, 3177 YOLD

In GHCi we can also execute shell commands.

Using Linux utility ddate

*Main> :! ddate
Today is Setting Orange, the 26th day of Bureaucracy in the YOLD 3176

*Main> :! ddate 29 2 2012
Sint Tibs

*Main> :! ddate 2 9 2010
Setting Orange, Bureaucracy 26, 3176 YOLD

Icon and Unicon

This version is loosely based on a modified translation of the original ddate.c and like the original the leap year functionality is Julian not Gregorian. <lang Icon>link printf

procedure main()

  Demo(2010,1,1)
  Demo(2010,7,22)
  Demo(2012,2,28)
  Demo(2012,2,29)
  Demo(2012,3,1)
  Demo(2010,1,5)
  Demo(2011,5,3)
  Demo(2012,2,28)
  Demo(2012,2,29)
  Demo(2012,3,1)
  Demo(2010,7,22)
  Demo(2012,12,22)

end

procedure Demo(y,m,d) #: demo display

  printf("%i-%i-%i = %s\n",y,m,d,DiscordianDateString(DiscordianDate(y,m,d)))

end

record DiscordianDateRecord(year,yday,season,sday,holiday)

procedure DiscordianDate(year,month,day) #: Convert normal date to Discordian static cal initial cal := [31,28,31,30,31,30,31,31,30,31,30,31]

  ddate := DiscordianDateRecord(year+1166)
  every (ddate.yday := day - 1) +:= cal[1 to month-1]   # zero origin
  ddate.sday := ddate.yday
  
  if ddate.year % 4 = 2 &  month = 2 & day = 29 then 
     ddate.holiday := 1   # Note: st tibs is outside of weekdays
  else {
     ddate.season  := (ddate.yday / 73) + 1   
     ddate.sday := (ddate.yday % 73) + 1
     ddate.holiday := 1 + ddate.season * case ddate.sday of { 5 : 1; 50 : 2}    
  }
  return ddate

end

procedure DiscordianDateString(ddate) #: format a Discordian Date String static days,seasons,holidays initial {

  days := ["Sweetmorn","Boomtime","Pungenday","Prickle-Prickle","Setting Orange"]
  seasons := ["Chaos","Discord","Confusion","Bureaucracy","The Aftermath"]
  holidays := ["St. Tib's Day","Mungday","Chaoflux","Mojoday","Discoflux",
               "Syaday","Confuflux","Zaraday","Bureflux","Maladay","Afflux"]                     
  }
  
  return (( holidays[\ddate.holiday] || "," ) |
          ( days[1+ddate.yday%5] || ", day " || 
            ddate.sday || " of " || seasons[ddate.season])) ||
         " in the YOLD " || ddate.year

end</lang>

Output:

2010-1-1 = Sweetmorn, day 1 of Chaos in the YOLD 3176
2010-7-22 = Pungenday, day 57 of Confusion in the YOLD 3176
2012-2-28 = Prickle-Prickle, day 59 of Chaos in the YOLD 3178
2012-2-29 = St. Tib's Day, in the YOLD 3178
2012-3-1 = Setting Orange, day 60 of Chaos in the YOLD 3178
2010-1-5 = Mungday, in the YOLD 3176
2011-5-3 = Discoflux, in the YOLD 3177
2012-2-28 = Prickle-Prickle, day 59 of Chaos in the YOLD 3178
2012-2-29 = St. Tib's Day, in the YOLD 3178
2012-3-1 = Setting Orange, day 60 of Chaos in the YOLD 3178
2010-7-22 = Pungenday, day 57 of Confusion in the YOLD 3176
2012-12-22 = Sweetmorn, day 64 of The Aftermath in the YOLD 3178

J

<lang j>require'dates' leap=: _1j1 * 0 -/@:= 4 100 400 |/ {.@] bs=: ((#:{.) + 0 j. *@[ * {:@]) +. disc=: ((1+0 73 bs[ +^:(58<]) -/@todayno@(,: 1 1,~{.)@]) ,~1166+{.@])~ leap</lang>

Example use:

<lang> disc 2012 2 28 3178 1 59

  disc 2012 2 29

3178 1 59j1

  disc 2012 3 1

3178 1 60j1

  disc 2012 12 31

3178 5 73j1

  disc 2013 1 1

3179 1 1

  disc 2100 12 31

3266 5 73

  disc 2015 10 19

3181 4 73

  disc 2000 3 13

3166 1 72j1</lang>

see talk page. But, in essence, this version uses season ordinals with a single imaginary day after the 59th of the first season, on leap years. This is implemented so that that imaginary day has been passed for all remaining days of a leap year.

Java

<lang java>import java.util.Calendar; import java.util.GregorianCalendar;

public class DiscordianDate {

   final static String[] seasons = {"Chaos", "Discord", "Confusion",
       "Bureaucracy", "The Aftermath"};

   final static String[] weekday = {"Sweetmorn", "Boomtime", "Pungenday",
       "Prickle-Prickle", "Setting Orange"};

   final static String[] apostle = {"Mungday", "Mojoday", "Syaday",
       "Zaraday", "Maladay"};

   final static String[] holiday = {"Chaoflux", "Discoflux", "Confuflux",
       "Bureflux", "Afflux"};

   public static String discordianDate(final GregorianCalendar date) {
       int y = date.get(Calendar.YEAR);
       int yold = y + 1166;
       int dayOfYear = date.get(Calendar.DAY_OF_YEAR);

       if (date.isLeapYear(y)) {
           if (dayOfYear == 60)
               return "St. Tib's Day, in the YOLD " + yold;
           else if (dayOfYear > 60)
               dayOfYear--;
       }

       dayOfYear--;

       int seasonDay = dayOfYear % 73 + 1;
       if (seasonDay == 5)
           return apostle[dayOfYear / 73] + ", in the YOLD " + yold;
       if (seasonDay == 50)
           return holiday[dayOfYear / 73] + ", in the YOLD " + yold;

       String season = seasons[dayOfYear / 73];
       String dayOfWeek = weekday[dayOfYear % 5];

       return String.format("%s, day %s of %s in the YOLD %s",
               dayOfWeek, seasonDay, season, yold);
   }

   public static void main(String[] args) {

       System.out.println(discordianDate(new GregorianCalendar()));

       test(2010, 6, 22, "Pungenday, day 57 of Confusion in the YOLD 3176");
       test(2012, 1, 28, "Prickle-Prickle, day 59 of Chaos in the YOLD 3178");
       test(2012, 1, 29, "St. Tib's Day, in the YOLD 3178");
       test(2012, 2, 1, "Setting Orange, day 60 of Chaos in the YOLD 3178");
       test(2010, 0, 5, "Mungday, in the YOLD 3176");
       test(2011, 4, 3, "Discoflux, in the YOLD 3177");
       test(2015, 9, 19, "Boomtime, day 73 of Bureaucracy in the YOLD 3181");
   }

   private static void test(int y, int m, int d, final String result) {
       assert (discordianDate(new GregorianCalendar(y, m, d)).equals(result));
   }

}</lang>

Output:

Setting Orange, day 4 of Confusion in the YOLD 3180

JavaScript

<lang javascript> /**

* All Hail Discordia! - this script prints Discordian date using system date.
*
* lang: JavaScript
* author: jklu
* contributors: JamesMcGuigan
*
* changelog:
* - Modified to return same output syntax as unix ddate + module.exports - James McGuigan, 2/Chaos/3183
*
* source: https://rosettacode.org/wiki/Discordian_date#JavaScript
*/

var seasons = [

 "Chaos", "Discord", "Confusion",
 "Bureaucracy", "The Aftermath"

]; var weekday = [

 "Sweetmorn", "Boomtime", "Pungenday",
 "Prickle-Prickle", "Setting Orange"

];

var apostle = [

 "Mungday", "Mojoday", "Syaday",
 "Zaraday", "Maladay"

];

var holiday = [

 "Chaoflux", "Discoflux", "Confuflux",
 "Bureflux", "Afflux"

];

Date.prototype.isLeapYear = function() {

 var year = this.getFullYear();
 if( (year & 3) !== 0 ) { return false; }
 return ((year % 100) !== 0 || (year % 400) === 0);

};

// Get Day of Year Date.prototype.getDOY = function() {

 var dayCount  = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334];
 var mn        = this.getMonth();
 var dn        = this.getDate();
 var dayOfYear = dayCount[mn] + dn;
 if( mn > 1 && this.isLeapYear() ) { dayOfYear++; }
 return dayOfYear;

};

Date.prototype.isToday = function() {

 var today = new Date();
 return this.getDate()     === today.getDate()
     && this.getMonth()    === today.getMonth()
     && this.getFullYear() === today.getFullYear()
 ;

};

function discordianDate(date) {

 if( !date ) { date = new Date(); }

 var y                = date.getFullYear();
 var yold             = y + 1166;
 var dayOfYear        = date.getDOY();
 var celebrateHoliday = null;

 if( date.isLeapYear() ) {
   if( dayOfYear == 60 ) {
     celebrateHoliday = "St. Tib's Day";
   }
   else if( dayOfYear > 60 ) {
     dayOfYear--;
   }
 }
 dayOfYear--;

 var divDay = Math.floor(dayOfYear / 73);

 var seasonDay = (dayOfYear % 73) + 1;
 if( seasonDay == 5 ) {
   celebrateHoliday = apostle[divDay];
 }
 if( seasonDay == 50 ) {
   celebrateHoliday = holiday[divDay];
 }

 var season    = seasons[divDay];
 var dayOfWeek = weekday[dayOfYear % 5];

 var nth = (seasonDay % 10 == 1) ? 'st'
         : (seasonDay % 10 == 2) ? 'nd'
         : (seasonDay % 10 == 3) ? 'rd'
                                 : 'th';

 return "" //(date.isToday() ? "Today is " : )
        + dayOfWeek
        + ", the " + seasonDay + nth
        + " day of " + season
        + " in the YOLD " + yold
        + (celebrateHoliday ? ". Celebrate " + celebrateHoliday + "!" : )
   ;

}

function test(y, m, d, result) {

 console.assert((discordianDate(new Date(y, m, d)) == result), [y, m, d, discordianDate(new Date(y, m, d)), result]);

}

// Only run test code if node calls this file directly if( require.main === module ) {

 console.log(discordianDate(new Date(Date.now())));
 test(2010, 6, 22, "Pungenday, the 57th day of Confusion in the YOLD 3176");
 test(2012, 1, 28, "Prickle-Prickle, the 59th day of Chaos in the YOLD 3178");
 test(2012, 1, 29, "Setting Orange, the 60th day of Chaos in the YOLD 3178. Celebrate St. Tib's Day!");
 test(2012, 2,  1, "Setting Orange, the 60th day of Chaos in the YOLD 3178");
 test(2010, 0,  5, "Setting Orange, the 5th day of Chaos in the YOLD 3176. Celebrate Mungday!");
 test(2011, 4,  3, "Pungenday, the 50th day of Discord in the YOLD 3177. Celebrate Discoflux!");
 test(2015, 9, 19, "Boomtime, the 73rd day of Bureaucracy in the YOLD 3181");

}

module.exports = discordianDate; </lang>

Example use:

<lang javascript> console.log(discordianDate(new Date(Date.now()))); "Boomtime, the 2nd day of Chaos in the YOLD 3183" </lang>

look at calendar; learn about holydays

JotaCode

<lang jotacode>@print(

 "Today is ",
 @let(1,@add(@switch(@time("mon"),
   0,-1,
   1,30,
   2,58,
   3,89,
   4,119,
   5,150,
   6,180,
   7,211,
   8,242,
   9,272,
   10,303,
   11,333)
 ,@time("mday")),@switch(@print(@time("mon"),"/",@time("mday")),
 "1/29","St. Tib's Day",
 @print(@switch(@mod("%1",5),
   0,"Sweetmorn",
   1,"Boomtime",
   2,"Pungenday",
   3,"Prickle-Prickle",
   4,"Setting Orange"),
 ", ",
 @switch(@idiv("%1",73),
   0,"Chaos",
   1,"Discord",
   2,"Confusion",
   3,"Bureaucracy",
   4,"The Aftermath"),
 " ",
 @add(@mod("%1",73),1),
 ", YOLD ",
 @add(@time("year"),3066))

)),".")</lang>

Julia

<lang julia>using Dates

function discordiandate(year::Integer, month::Integer, day::Integer)

   discordianseasons = ["Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"]
   holidays = Dict(
       "Chaos 5" => "Mungday",
       "Chaos 50" => "Chaoflux",
       "Discord 5" => "Mojoday",
       "Discord 50" => "Discoflux",
       "Confusion 5" => "Syaday",
       "Confusion 50" => "Confuflux",
       "Bureaucracy 5" => "Zaraday",
       "Bureaucracy 50" => "Bureflux",
       "The Aftermath 5" => "Maladay",
       "The Aftermath 50" => "Afflux")
   today = Date(year, month, day)
   isleap = isleapyear(year)
   if isleap && month == 2 && day == 29
       rst = "St. Tib's Day, YOLD " * string(year + 1166)
   else
       dy = dayofyear(today)
       if isleap && dy >= 60
           dy -= 1
       end
       rst = string(discordianseasons[div(dy, 73) + 1], " ", rem(dy, 73)) # day
       if haskey(holidays, rst)
           rst *= " ($(holidays[rst]))" # if holiday
       end
       rst *= ", YOLD $(year + 1166)" # year
   end
   return rst

end

@show discordiandate(2017, 08, 15) @show discordiandate(1996, 02, 29) @show discordiandate(1996, 02, 19)</lang>

Output:

discordiandate(2017, 8, 15) = "Bureaucracy 8, YOLD 3183"
discordiandate(1996, 2, 29) = "St. Tib's Day, YOLD 3162"
discordiandate(1996, 2, 19) = "Chaos 50 (Chaoflux), YOLD 3162"

Kotlin

Translation of: Java

<lang scala>import java.util.Calendar import java.util.GregorianCalendar

enum class Season {

   Chaos, Discord, Confusion, Bureaucracy, Aftermath;
   companion object { fun from(i: Int) = values()[i / 73] }

} enum class Weekday {

   Sweetmorn, Boomtime, Pungenday, Prickle_Prickle, Setting_Orange;
   companion object { fun from(i: Int) = values()[i % 5] }

} enum class Apostle {

   Mungday, Mojoday, Syaday, Zaraday, Maladay;
   companion object { fun from(i: Int) = values()[i / 73] }

} enum class Holiday {

   Chaoflux, Discoflux, Confuflux, Bureflux, Afflux;
   companion object { fun from(i: Int) = values()[i / 73] }

}

fun GregorianCalendar.discordianDate(): String {

   val y = get(Calendar.YEAR)
   val yold = y + 1166

   var dayOfYear = get(Calendar.DAY_OF_YEAR)
   if (isLeapYear(y)) {
       if (dayOfYear == 60)
           return "St. Tib's Day, in the YOLD " + yold
       else if (dayOfYear > 60)
           dayOfYear--
   }

   val seasonDay = --dayOfYear % 73 + 1
   return when (seasonDay) {
       5 -> "" + Apostle.from(dayOfYear) + ", in the YOLD " + yold
       50 -> "" + Holiday.from(dayOfYear) + ", in the YOLD " + yold
       else -> "" + Weekday.from(dayOfYear) + ", day " + seasonDay + " of " + Season.from(dayOfYear) + " in the YOLD " + yold
   }

}

internal fun test(y: Int, m: Int, d: Int, result: String) {

   assert(GregorianCalendar(y, m, d).discordianDate() == result)

}

fun main(args: Array<String>) {

   println(GregorianCalendar().discordianDate())

   test(2010, 6, 22, "Pungenday, day 57 of Confusion in the YOLD 3176")
   test(2012, 1, 28, "Prickle-Prickle, day 59 of Chaos in the YOLD 3178")
   test(2012, 1, 29, "St. Tib's Day, in the YOLD 3178")
   test(2012, 2, 1, "Setting Orange, day 60 of Chaos in the YOLD 3178")
   test(2010, 0, 5, "Mungday, in the YOLD 3176")
   test(2011, 4, 3, "Discoflux, in the YOLD 3177")
   test(2015, 9, 19, "Boomtime, day 73 of Bureaucracy in the YOLD 3181")

}</lang>

MAD

<lang MAD> R DISCORDIAN DATE CALCULATION

         R
         R   PUNCH CARD SHOULD CONTAIN -
         R   MM/DD/YYYY
         R   IN GREGORIAN CALENDAR 
         
           NORMAL MODE IS INTEGER
           
           VECTOR VALUES MLENGT = 
         0   0,0,31,59,90,120,151,181,212,243,273,304,334
           VECTOR VALUES TIBS = 
         0   $31HSAINT TIBS DAY IN THE Y.O.L.D. ,I4*$
           VECTOR VALUES DISDAT = 
         0   $C,6H, DAY ,I2,S1,3HOF ,C,S1,16HIN THE Y.O.L.D. ,I4*$
           
           VECTOR VALUES DISDAY = $SWEETMORN$, $BOOMTIME$,
         0   $PUNGENDAY$, $PRICKLE-PRICKLE$, $SETTING ORANGE$
           VECTOR VALUES DISSSN = $CHAOS$, $DISCORD$,
         0   $CONFUSION$, $BUREAUCRACY$, $THE AFTERMATH$
         
           VECTOR VALUES CLDAY  = $10HCELEBRATE ,C,3HDAY*$
           VECTOR VALUES CLFLUX = $10HCELEBRATE ,C,4HFLUX*$
           VECTOR VALUES HOLY5  = $MUNG$,$MOJO$,$SYA$,$ZARA$,$MALA$
           VECTOR VALUES HOLY50 = $CHAO$,$DISCO$,$CONFU$,$BURE$,$AF$
         
           READ FORMAT GREG,GMONTH,GDAY,GYEAR
           VECTOR VALUES GREG = $2(I2,1H/),I4*$

           WHENEVER GMONTH.E.2 .AND. GDAY.E.29
               PRINT FORMAT TIBS, GYEAR + 1166
           OTHERWISE
               YRDAY = MLENGT(GMONTH)+GDAY
               SEASON = YRDAY/73
               DAY = YRDAY-SEASON*73
               WKDAY = (YRDAY-1)-(YRDAY-1)/5*5
               PRINT FORMAT DISDAT, DISDAY(WKDAY), DAY,
         0         DISSSN(SEASON), GYEAR + 1166
               WHENEVER DAY.E.5
                   PRINT FORMAT CLDAY, HOLY5(SEASON)
               OR WHENEVER DAY.E.50
                   PRINT FORMAT CLFLUX, HOLY50(SEASON)
               END OF CONDITIONAL 
           END OF CONDITIONAL          
           END OF PROGRAM</lang>

Output:

01/05/2005
SETTING ORANGE, DAY  5 OF CHAOS IN THE Y.O.L.D. 3171
CELEBRATE MUNGDAY

09/26/1995
PRICKLE-PRICKLE, DAY 50 OF BUREAUCRACY IN THE Y.O.L.D. 3161
CELEBRATE BUREFLUX

02/29/1996
SAINT TIBS DAY IN THE Y.O.L.D. 3162

12/05/2020
PRICKLE-PRICKLE, DAY 47 OF THE AFTERMATH IN THE Y.O.L.D. 3186

Maple

<lang maple>convertDiscordian := proc(year, month, day) local days31, days30, daysThisYear, i, dYear, dMonth, dDay, seasons, week, dayOfWeek; days31 := [1, 3, 5, 7, 8, 10, 12]; days30 := [4, 6, 9, 11]; if month < 1 or month >12 then error "Invalid month: %1", month; end if; if (member(month, days31) and day > 31) or (member(month, days30) and day > 30) or (month = 2 and day > 29) or day < 1 then error "Invalid date: %1", day; end if; dYear := year + 1166; if month = 2 and day = 29 then printf("The date is St. Tib's Day, YOLD %a.\n", dYear); else seasons := ["Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"]; week := ["Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange"]; daysThisYear := 0; for i to month-1 do if member(i, days31) then daysThisYear := daysThisYear + 31; elif member(i, days30) then daysThisYear := daysThisYear + 30; else daysThisYear := daysThisYear + 28; end if; end do; daysThisYear := daysThisYear + day -1; dMonth := seasons[trunc((daysThisYear) / 73)+1]; dDay := daysThisYear mod 73 +1; dayOfWeek := week[daysThisYear mod 5 +1]; printf("The date is %s %s %s, YOLD %a.\n", dayOfWeek, dMonth, convert(dDay, ordinal), dYear); end if; end proc:

convertDiscordian (2016, 1, 1); convertDiscordian (2016, 2, 29); convertDiscordian (2016, 12, 31);</lang>

Output:

The date is Sweetmorn Chaos first, YOLD 3182.
The date is St. Tib's Day, YOLD 3182.
The date is Setting Orange The Aftermath 73rd, YOLD 3182.

Mathematica / Wolfram Language

<lang Mathematica>DiscordianDate[y_, m_, d_] := Module[{year = ToString[y + 1166], month = m, day = d},

 DMONTHS = {"Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"};
 DDAYS = {"Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange"};
 DayOfYear = DateDifference[{y} ,{y, m, d}] + 1;
 LeapYearQ = (Mod[#, 4]== 0 && (Mod[#, 100] != 0 || Mod[#, 400] == 0))&@ y;

 If [ LeapYearQ && month == 2 && day == 29,
   Print["Today is St. Tib's Day, YOLD ", ]
 ,
   If [ LeapYearQ && DayOfYear >= 60, DayOfYear -= 1 ];
    {season, dday} = {Quotient[DayOfYear, 73], Mod[DayOfYear, 73]};
    Print["Today is ", DDAYS[[Mod[dday,4] + 1]],", ",DMONTHSseason+1," ",dday,", YOLD ",year]
   ];

]</lang>

Output:

DiscordianDate[2012,2,28]
-> Today is Prickle-Prickle, Chaos 59, YOLD 3178

DiscordianDate[2012,2,29]
-> Today is St. Tib's Day, YOLD 3178

DiscordianDate[2012,3,1]
-> Today is Setting Orange, Chaos 60, YOLD 3178

Nim

We use a DateTime object as intermediate representation. <lang Nim>import times, strformat

const

 DiscordianOrigin = -1166
 SaintTibsDay = "St. Tib’s Day"

type

 Season = enum
   sCha = (1, "Chaos"), sDis = "Discord", sCon = "Confusion",
   sBur = "Bureaucracy", sAft = "The Aftermath"

 ErisianWeekDay = enum
   eSwe = "Sweetmorn", eBoo = "Boomtime", ePun = "Pungenday",
   ePri = "Prickle-Prickle", eSet = "Setting Orange"

 SeasonDayRange = range[1..73]

 # Description of a discordian date.
 DiscordianDate = object
   year: int
   yearday: YeardayRange
   case isSaintTibsDay: bool
   of false:
     seasondayZero: int
     seasonZero: int
     weekday: ErisianWeekDay
   else:
     nil

---------------------------------------------------------------------------------------------------

proc toDiscordianDate(gdate: DateTime): DiscordianDate =

 ## Convert a DateTime to a discordian date.
 ## All the time fields are ignored.

 # Create the object.
 result = DiscordianDate(isSaintTibsDay: gdate.isLeapDay)

 # The yearday field is unchanged.
 result.yearday = gdate.yearday

 # The year is simply translated.
 result.year = gdate.year - DiscordianOrigin

 # For remaining fields, we must take in account leap years.
 if not result.isSaintTibsDay:
   var yearday = result.yearday
   if gdate.year.isLeapYear and result.yearday > 59:
     dec yearday
   # Now, we have simply to use division and modulo using the corrected yearday.
   result.seasonZero = yearday div SeasonDayRange.high
   result.seasondayZero = yearday mod SeasonDayRange.high
   result.weekday = ErisianWeekDay(yearday mod 5)

---------------------------------------------------------------------------------------------------

proc `$`(date: DiscordianDate): string =

 ## Convert a discordian date to a string.
 if date.isSaintTibsDay:
   result = SaintTibsDay
 else:
   result = fmt"{date.weekday}, {Season(date.seasonZero + 1)} {date.seasondayZero + 1}"
 result &= fmt", {date.year} YOLD"

---------------------------------------------------------------------------------------------------

proc showDiscordianDate(year, month, day: Natural) =

 ## Show the discordian date corresponding to a gregorian date.
 let gdate = initDateTime(year = year, month = Month(month), monthday = day,
                          hour = 0, minute = 0, second = 0)
 echo gdate.format("YYYY-MM-dd"), ": ", $gdate.toDiscordianDate()

———————————————————————————————————————————————————————————————————————————————————————————————————

showDiscordianDate(2100, 12, 31) showDiscordianDate(2012, 02, 28) showDiscordianDate(2012, 02, 29) showDiscordianDate(2012, 03, 01) showDiscordianDate(2010, 07, 22) showDiscordianDate(2012, 09, 02) showDiscordianDate(2012, 12, 31)</lang>

Output:

2100-12-31: Setting Orange, The Aftermath 73, 3266 YOLD
2012-02-28: Prickle-Prickle, Chaos 59, 3178 YOLD
2012-02-29: St. Tib’s Day, 3178 YOLD
2012-03-01: Setting Orange, Chaos 60, 3178 YOLD
2010-07-22: Pungenday, Confusion 57, 3176 YOLD
2012-09-02: Setting Orange, Bureaucracy 26, 3178 YOLD
2012-12-31: Setting Orange, The Aftermath 73, 3178 YOLD

Pascal

<lang Pascal> program ddate; { This program is free software, it's done it's time and paid for it's crime. You can copy, edit and use this software under the terms of the GNU GPL v3 or later.

Copyright Pope Englebert Finklestien, On this day Boomtime, the 71st day of Confusion in the YOLD 3183

This program will print out the current date in Erisian format as specified in

                 P R I N C I P I A   D I S C O R D I A

If you run it with a date it the command line in european format (dd mm yy) it will print the equvolent Discordian date. If you omit the year and month the current Anerisiean month and year as assumed.

POPE Englebert Finklestien. } uses Sysutils;

var

 YY,MM,DD : word;
 YOLD : Boolean;
 Hedgehog: integer;
 Eris: string;
 snub: string;
 chaotica: string;
 midget: string;
 bob: string;

 Anerisiandaysinmonth: array[1..12] of integer = (31,28,31,30,31,30,31,31,30,31,30,31);

procedure anerisiandate; { tHIS JUST GETS THE DATE INTO THE DD,MM,YY VARIABLES } begin

   DeCodeDate(date,yy,mm,dd);

end;

procedure BORIS; { This just tests to see if we are in a leap year } var

 snafu : boolean;

begin

 snafu := False;
 if (yy mod 4 = 0) then snafu := True;
 if ((yy mod 100 = 0) and (yy mod 400 <> 0)) then snafu := False;
 if ((snafu) and (mm = 2 ) and (dd=29)) then YOLD := True;

end;

function hodgepodge: integer; { This returns the total number of days since the year began. It doesn't bother with leap years at all. I get a wierd optical illusion looking at the until in this } var

 fnord : integer;

begin

  Hedgehog := 1;
  hodgepodge := 0;
  fnord :=0;
  if (mm > 1) then repeat
            fnord := fnord + Anerisiandaysinmonth[Hedgehog];
            Hedgehog := Hedgehog +1;
      until Hedgehog = mm;
  fnord := fnord + dd;
  hodgepodge := fnord;
end;

function treesaregreen(): string; {Returns the YOLD as a string}

begin

   treesaregreen := IntTOStr(yy+1166);

end;

procedure GRAYFACE; {This calculates everything, but does not bother much about leap years} var

  wrestle: integer;
  Thwack: string;

begin

   Hedgehog := hodgepodge;
   wrestle := 0;
   Thwack := 'th';
   {set bob to the name of the holyday or St. Tibs day }
   bob := 'St. Tibs Day';         
   if (Hedgehog = 5 )  then bob := 'Mungday';
   if (Hedgehog = 50 ) then bob := 'Chaoflux';
   if (Hedgehog = 78 ) then bob := 'Mojoday';
   if (Hedgehog = 123) then bob := 'Discoflux';
   if (Hedgehog = 151) then bob := 'Syaday';
   if (Hedgehog = 196) then bob := 'Confuflux';
   if (Hedgehog = 224) then bob := 'Zaraday';
   if (Hedgehog = 269) then bob := 'Bureflux';
   if (Hedgehog = 297) then bob := 'Maladay';
   if (Hedgehog = 342) then bob := 'Afflux';
   {Not doing things the usual way
   Lets find the week day and count the number of

5 day weeks all at the same time}

   while (Hedgehog > 5) do begin 
     Hedgehog := Hedgehog -5;
     wrestle := Wrestle + 1;
   end;
   if (Hedgehog = 1) then snub := 'Sweetmorn'  ;
   if (Hedgehog = 2) then snub := 'BoomTime';
   if (Hedgehog = 3) then snub := 'Pungenday';
   if (Hedgehog = 4) then snub := 'Prickle-Prickle';
   if (Hedgehog = 5) then snub := 'Setting Orange';

{Now to set the Season name}

   chaotica:='The Aftermath';
   if (wrestle <=57) then chaotica := 'Bureaucracy';
   if ((wrestle = 58) and (Hedgehog < 3)) then chaotica := 'Bureaucracy';
   if (wrestle <= 42) then chaotica := 'Confusion';
   if ((wrestle = 43) and (Hedgehog < 5)) then chaotica := 'Confusion';
   if (wrestle <=28) then chaotica := 'Discord';
   if ((wrestle = 29) and (Hedgehog < 2)) then chaotica := 'Discord';
   if (wrestle <=13) then chaotica := 'Chaos';
   if ((wrestle = 14) and (Hedgehog < 4)) then chaotica := 'Chaos';

{Now all we need the day of the season}

   wrestle := (wrestle*5)+Hedgehog;
   while (wrestle >73) do wrestle := wrestle -73;

{pick the appropriate day postfix, allready set to th}

   if (wrestle in [1,21,31,41,51,61,71]) then Thwack:='st';
   if (wrestle in [2,22,32,42,52,62,72]) then Thwack:='nd';
   if (wrestle in [3,23,33,43,53,63,73]) then Thwack:='rd';

{Check to see if it is a holy day, if so bob will have the right holyday name already, including St Tibs Day}

   if (wrestle in [5,50]) then YOLD := True;

{I love this line of code}

   midget := IntToStr(wrestle) + Thwack;

end;

{The main program starts here} begin

   anerisiandate;
   if (ParamCount >=1) then dd := StrTOInt(ParamStr(1));
   if (ParamCount >=2) then mm := StrToInt(ParamStr(2));
   if (ParamCount =3) then yy := StrToInt(ParamStr(3));
   BORIS;
   GRAYFACE;

{ The only thing to bother about is holy days and St Tibs day }

   Eris := 'Today is: ' + snub +' the ' + midget +' day of the season of ' + chaotica;
   if (YOLD) then begin

Eris := 'Celebrate for today, ' + snub + ' the ' + midget + ' day of ' +chaotica + ' is the holy day of ' + bob;

   end;

{The only place we deal with St. Tibs Day}

   if ((YOLD) and ((mm=2) and (dd=29))) then Eris := 'Celebrate ' + bob + ' Chaos';

{This next line applies to all possibilities}

   Eris := Eris + ' YOLD ' + treesaregreen;
   WriteLn(Eris);

end. </lang>

Output:


 ./ddate
Today is: Setting Orange the 1st day of the season of The Aftermath YOLD 3183
./ddate 12
Celebrate for today, Prickle-Prickle the 5th day of The Aftermath is the holy day of Zaraday YOLD 3183
./ddate 13 5
Today is: Pungenday the 60th day of the season of Confusion YOLD 3183
./ddate 29 2 2020
Celebrate St. Tibs Day Chaos YOLD 3186

Perl

Translation of: Raku

<lang perl>use 5.010; use strict; use warnings; use Time::Piece ();

my @seasons = (qw< Chaos Discord Confusion Bureaucracy >, 'The Aftermath'); my @week_days = (qw< Sweetmorn Boomtime Pungenday Prickle-Prickle >, 'Setting Orange');

sub ordinal { my ($n) = @_; return $n . "th" if int($n/10) == 1; return $n . ((qw< th st nd rd th th th th th th>)[$n % 10]); }

sub ddate { my $d = Time::Piece->strptime( $_[0], '%Y-%m-%d' ); my $yold = 'in the YOLD ' . ($d->year + 1166);

my $day_of_year0 = $d->day_of_year;

if( $d->is_leap_year ) { return "St. Tib's Day, $yold" if $d->mon == 2 and $d->mday == 29; $day_of_year0-- if $day_of_year0 >= 60; # Compensate for St. Tib's Day }

my $weekday = $week_days[ $day_of_year0 % @week_days ]; my $season = $seasons[ $day_of_year0 / 73 ]; my $season_day = ordinal( $day_of_year0 % 73 + 1 );

return "$weekday, the $season_day day of $season $yold"; }

say "$_ is " . ddate($_) for qw< 2010-07-22 2012-02-28 2012-02-29 2012-03-01 >; </lang>

Output:

2010-07-22 is Pungenday, the 57th day of Confusion in the YOLD 3176
2012-02-28 is Prickle-Prickle, the 59th day of Chaos in the YOLD 3178
2012-02-29 is St. Tib's Day, in the YOLD 3178
2012-03-01 is Setting Orange, the 60th day of Chaos in the YOLD 3178

Phix

with javascript_semantics
constant seasons = {"Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"},
         weekday = {"Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange"},
         apostle = {"Mungday", "Mojoday", "Syaday", "Zaraday", "Maladay"},
         holiday = {"Chaoflux", "Discoflux", "Confuflux", "Bureflux", "Afflux"}
 
function discordianDate(sequence dt)
    integer {y,m,d} = dt, 
            leap = is_leap_year(y),
            doy = day_of_year(y,m,d)-1
    string dyear = sprintf("%d",y+1166)
    if leap and m=2 and d=29 then
        return "St. Tib's Day, in the YOLD " & dyear
    end if
    if leap and doy>=60 then
        doy -= 1
    end if
    integer dsday = remainder(doy,73)+1,
            dseason = floor(doy/73+1)
    if dsday=5 then
        return apostle[dseason] & ", in the YOLD " & dyear
    elsif dsday=50 then
        return holiday[dseason] & ", in the YOLD " & dyear
    end if
    string dseas = seasons[dseason],
           dwday = weekday[remainder(doy,5)+1]
    return sprintf("%s, day %d of %s in the YOLD %s", {dwday, dsday, dseas, dyear})
end function

-- test code

sequence dt = {2015,1,1,0,0,0,0,0}
include timedate.e
atom oneday = timedelta(days:=1)
set_timedate_formats({"DD/MM/YYYY"})
for i=1 to 5 do
    printf(1,"%s: %s\n",{format_timedate(dt),discordianDate(dt)})
    dt = adjust_timedate(dt,oneday*72)
    printf(1,"%s: %s\n",{format_timedate(dt),discordianDate(dt)})
    dt = adjust_timedate(dt,oneday)
end for

Output:

"01/01/2015: Sweetmorn, day 1 of Chaos in the YOLD 3181"
"14/03/2015: Pungenday, day 73 of Chaos in the YOLD 3181"
"15/03/2015: Prickle-Prickle, day 1 of Discord in the YOLD 3181"
"26/05/2015: Sweetmorn, day 73 of Discord in the YOLD 3181"
"27/05/2015: Boomtime, day 1 of Confusion in the YOLD 3181"
"07/08/2015: Prickle-Prickle, day 73 of Confusion in the YOLD 3181"
"08/08/2015: Setting Orange, day 1 of Bureaucracy in the YOLD 3181"
"19/10/2015: Boomtime, day 73 of Bureaucracy in the YOLD 3181"
"20/10/2015: Pungenday, day 1 of The Aftermath in the YOLD 3181"
"31/12/2015: Setting Orange, day 73 of The Aftermath in the YOLD 3181"

PHP

<lang PHP> <?php

   $Anerisia = array(31,28,31,30,31,30,31,31,30,31,30,31);
   $MONTHS = array("Choas","Discord","Confusion","Bureacracy","The Aftermath");
   $DAYS = array("Setting Orange","Sweetmorn","BoomTime","Pungenday","Prickle-Prickle");
   $Dsuff = array('th','st','nd','rd','th','th','th','th','th','th');
   $Holy5 = array("Mungday","MojoDay","Syaday","Zaraday","Maladay");
   $Holy50 = array("Chaoflux","Discoflux","Confuflux","Bureflux","Afflux");

   // Get the current system date and assign to some variables

$edate = explode(" ",date('Y m j L')); $usery = $edate[0]; $userm = $edate[1]; $userd = $edate[2]; $IsLeap = $edate[3];

 // If the user supplied us with a date overide the one we got from the system.
 // If you could get the date from users browser via javascript and then call
 // this script with the users date. ddate.php?y=year&m=month&d=day mostly it
 // won't matter but if the server is in a different time zone to the user
 // There will be occasional incorrect results from the users POV.

   if (isset($_GET['y']) && isset($_GET['m']) && isset($_GET['d'])) {
       $usery = $_GET['y'];
       $userm = $_GET['m'];
       $userd = $_GET['d'];
       $IsLeap = 0;
       if (($usery%4 == 0) && ($usery%100 >0)) $IsLeap =1;
       if ($usery%400 == 0) $IsLeap = 1;
   }

// We need to know the total number of days in the year so far

   $userdays = 0;
   $i = 0;
   while ($i < ($userm-1)) {
       
       $userdays = $userdays + $Anerisia[$i];
       $i = $i +1;
   }
   $userdays = $userdays + $userd;

   // We can now work out the full discordian date for most dates
   // PHP does not do integer division, so we use 73.2 as a divisor
   // the value 73.2 works, larger values cause an off-by-one on season
   // changes for the later seasons .
   // This is not needed with the mod operator.

   $IsHolyday = 0;
   $dyear = $usery + 1166;
   $dmonth = $MONTHS[$userdays/73.2];
   $dday = $userdays%73;

if (0 == $dday) $dday = 73;

   $Dname = $DAYS[$userdays%5];
   $Holyday = "St. Tibs Day";
   if ($dday == 5) {
       $Holyday = $Holy5[$userdays/73.2];
       $IsHolyday =1;
   }
   if ($dday == 50) {
       $Holyday = $Holy50[$userdays/73.2];
       $IsHolyday =1;
   }

 if (($IsLeap ==1) && ($userd ==29) and ($userm ==2)) $IsHolyday = 2;

  // work out the suffix to the day number
  $suff = $Dsuff[$dday%10] ;
  if ((11 <= $dday) && (19 >= $dday)) $suff='th';

   // code to display the date ...

if ($IsHolyday ==2)
     echo "
Celeberate ",$Holyday," ",$dmonth," YOLD ",$dyear;
   if ($IsHolyday ==1)
     echo "
Celeberate for today ", $Dname , " The ", $dday,"^",$suff,"", " day of ", $dmonth , " YOLD " , $dyear , " is the holy day of " , $Holyday;
   if ($IsHolyday == 0)
      echo "
Today is " , $Dname , " the " , $dday ,"^{",$suff, "} day of " , $dmonth , " YOLD " , $dyear;

?>

</lang>

Output:

ddate.php #23 November 2011
Today is Boomtime the 35th day of The Aftermath YOLD 3177

ddate.php?y=2012&m=2&y=28
Today is Prickle-Prickle the 59th day of Chaos YOLD 3178

ddate.php?y=2012&m=2&y=29
Celeberate St. Tibs Day, Chaos YOLD 3178

ddate.php?y=2017&m=8&d=12
Celeberate for today Prickle-Prickle The 5th day of Bureacracy YOLD 3183 is the holy day of Zaraday

PicoLisp

Translation of: Python

<lang PicoLisp>(de disdate (Year Month Day)

  (let? Date (date Year Month Day)
     (let (Leap (date Year 2 29)  D (- Date (date Year 1 1)))
        (if (and Leap (= 2 Month) (= 29 Day))
           (pack "St. Tib's Day, YOLD " (+ Year 1166))
           (and Leap (>= D 60) (dec 'D))
           (pack
              (get
                 '("Chaos" "Discord" "Confusion" "Bureaucracy" "The Aftermath")
                 (inc (/ D 73)) )
              " "
              (inc (% D 73))
              ", YOLD "
              (+ Year 1166) ) ) ) ) )</lang>

Pike

Pike includes a Discordian calendar. dates can be converted from any calendar to any other. <lang Pike>> Calendar.Discordian.now()->format_ext_ymd();

Result: "Pungenday, 59 Bureaucracy 3177"

> Calendar.Discordian.Day(Calendar.Day(2011,11,11))->format_ext_ymd();

Result: "Setting Orange, 23 The Aftermath 3177"

> Calendar.Discordian.Day(Calendar.Badi.Day(168,13,9))->format_ext_ymd();

Result: "Setting Orange, 23 The Aftermath 3177"

> Calendar.Day((Calendar.Discordian.Month()+1)->day(1));

Result: Day(Thu 20 Oct 2011)</lang>

PowerBASIC

<lang powerbasic>#COMPILE EXE

DIM ALL

'change this for systems that use a different character $DATESEP = "-"

FUNCTION day(date AS STRING) AS LONG

   'date is same format as date$
   DIM tmpdash1 AS LONG, tmpdash2 AS LONG
   tmpdash1 = INSTR(date, $DATESEP)
   tmpdash2 = INSTR(-1, date, $DATESEP)
   FUNCTION = VAL(MID$(date, tmpdash1 + 1, tmpdash2 - tmpdash1 - 1))

END FUNCTION

FUNCTION month(date AS STRING) AS LONG

   'date is same format as date$
   DIM tmpdash AS LONG
   tmpdash = INSTR(date, $DATESEP)
   FUNCTION = VAL(LEFT$(date, tmpdash - 1))

END FUNCTION

FUNCTION year(date AS STRING) AS LONG

   'date is same format as date$
   DIM tmpdash AS LONG
   tmpdash = INSTR(-1, date, $DATESEP)
   FUNCTION = VAL(MID$(date, tmpdash + 1))

END FUNCTION

FUNCTION julian(date AS STRING) AS LONG

   'date is same format as date$
   'doesn't account for leap years (not needed for ddate)
   'days preceding 1st of month
   '   jan feb mar apr may  jun  jul  aug  sep  oct  nov  dec
   DATA 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
   FUNCTION = VAL(READ$(month(date))) + day(date)

END FUNCTION

FUNCTION PBMAIN () AS LONG

   'Season names
   DATA "Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"
   'Weekdays
   DATA "Setting Orange", "Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle"

   DIM dyear AS LONG, dseason AS STRING, dday AS LONG, dweekday AS STRING
   DIM tmpdate AS STRING, jday AS LONG, result AS STRING

   IF LEN(COMMAND$) THEN
       tmpdate = COMMAND$
   ELSE
       tmpdate = DATE$
   END IF
   dyear = year(tmpdate) + 1166
   IF (2 = month(tmpdate)) AND (29 = day(tmpdate)) THEN
       result = "Saint Tib's Day, " & STR$(dyear) & " YOLD"
   ELSE
       jday = julian(tmpdate)
       dseason = READ$((jday \ 73) + 1)
       dday = (jday MOD 73)
       IF 0 = dday THEN dday = 73
       dweekday = READ$((jday MOD 5) + 6)
       result = dweekday & ", " & dseason & " " & TRIM$(STR$(dday)) & ", " & TRIM$(STR$(dyear)) & " YOLD"
   END IF

   ? result

END FUNCTION</lang>

PowerShell

Works with: powershell version 2

<lang powershell> function ConvertTo-Discordian ( [datetime]$GregorianDate ) { $DayOfYear = $GregorianDate.DayOfYear $Year = $GregorianDate.Year + 1166 If ( [datetime]::IsLeapYear( $GregorianDate.Year ) -and $DayOfYear -eq 60 )

   { $Day = "St. Tib's Day" }

Else

   {
   If ( [datetime]::IsLeapYear( $GregorianDate.Year ) -and $DayOfYear -gt 60 )
       { $DayOfYear-- }
   $Weekday = @( 'Sweetmorn', 'Boomtime', 'Pungenday', 'Prickle-Prickle', 'Setting Orange' )[(($DayOfYear - 1 ) % 5 )]
   $Season  = @( 'Chaos', 'Discord', 'Confusion', 'Bureaucracy', 'The Aftermath' )[( [math]::Truncate( ( $DayOfYear - 1 ) / 73 ) )]
   $DayOfSeason = ( $DayOfYear - 1 ) % 73 + 1
   $Day = "$Weekday, $Season $DayOfSeason"
   }

$DiscordianDate = "$Day, $Year YOLD" return $DiscordianDate }

ConvertTo-Discordian ([datetime]'1/5/2016') ConvertTo-Discordian ([datetime]'2/29/2016') ConvertTo-Discordian ([datetime]'12/8/2016') </lang>

Output:

Setting Orange, Chaos 5, 3182 YOLD
St. Tib's Day, 3182 YOLD
Boomtime, The Aftermath 50, 3182 YOLD

Prolog

Works with: SWI Prolog

<lang prolog>% See https://en.wikipedia.org/wiki/Discordian_calendar

main:-

   test(2022, 4, 20),
   test(2020, 5, 24),
   test(2020, 2, 29),
   test(2019, 7, 15),
   test(2025, 3, 19),
   test(2017, 12, 8).

test(Gregorian_year, Gregorian_month, Gregorian_day):-

   ddate(Gregorian_year, Gregorian_month, Gregorian_day,
         Discordian_date),
   format('~|~`0t~d~2+-~|~`0t~d~2+-~|~`0t~d~2+: ~w~n', [Gregorian_year,
          Gregorian_month, Gregorian_day, Discordian_date]).

ddate(Gregorian_year, 2, 29, Discordian_date):-

   convert_year(Gregorian_year, Discordian_year),
   swritef(Discordian_date, 'St. Tib\'s Day in the YOLD %w',
           [Discordian_year]),
   !.

ddate(Gregorian_year, Gregorian_month, Gregorian_day,

     Discordian_date):-
   convert_year(Gregorian_year, Discordian_year),
   day_of_year(Gregorian_month, Gregorian_day, Daynum),
   Season is Daynum//73,
   Weekday is Daynum mod 5,
   Day_of_season is 1 + Daynum mod 73,
   season(Season, Season_name),
   week_day(Weekday, Day_name),
   (holy_day(Season, Day_of_season, Holy_day) ->
       swritef(Discordian_date, '%w, day %w of %w in the YOLD %w. Celebrate %w!',
               [Day_name, Day_of_season, Season_name, Discordian_year, Holy_day])
       ;
       swritef(Discordian_date, '%w, day %w of %w in the YOLD %w',
               [Day_name, Day_of_season, Season_name, Discordian_year])
   ).

convert_year(Gregorian_year, Discordian_year):-

   Discordian_year is Gregorian_year + 1166.

day_of_year(M, D, N):-

   month_days(M, Days),
   N is Days + D - 1.

month_days(1, 0). month_days(2, 31). month_days(3, 59). month_days(4, 90). month_days(5, 120). month_days(6, 151). month_days(7, 181). month_days(8, 212). month_days(9, 243). month_days(10, 273). month_days(11, 304). month_days(12, 334).

season(0, 'Chaos'). season(1, 'Discord'). season(2, 'Confusion'). season(3, 'Bureacracy'). season(4, 'The Aftermath').

week_day(0, 'Sweetmorn'). week_day(1, 'Boomtime'). week_day(2, 'Pungenday'). week_day(3, 'Prickle-Prickle'). week_day(4, 'Setting Orange').

holy_day(0, 5, 'Mungday'). holy_day(0, 50, 'Chaoflux'). holy_day(1, 5, 'Mojoday'). holy_day(1, 50, 'Discoflux'). holy_day(2, 5, 'Syaday'). holy_day(2, 50, 'Confuflux'). holy_day(3, 5, 'Zaraday'). holy_day(3, 50, 'Bureflux'). holy_day(4, 5, 'Maladay'). holy_day(4, 50, 'Afflux').</lang>

Output:

2022-04-20: Setting Orange, day 37 of Discord in the YOLD 3188
2020-05-24: Prickle-Prickle, day 71 of Discord in the YOLD 3186
2020-02-29: St. Tib's Day in the YOLD 3186
2019-07-15: Sweetmorn, day 50 of Confusion in the YOLD 3185. Celebrate Confuflux!
2025-03-19: Pungenday, day 5 of Discord in the YOLD 3191. Celebrate Mojoday!
2017-12-08: Boomtime, day 50 of The Aftermath in the YOLD 3183. Celebrate Afflux!

PureBasic

<lang PureBasic>Procedure.s Discordian_Date(Y, M, D)

 Protected DoY=DayOfYear(Date(Y,M,D,0,0,0)), Yold$=Str(Y+1166)
 Dim S.s(4)
 S(0)="Chaos": S(1)="Discord": S(2)="Confusion": S(3)="Bureaucracy"
 S(4)="The Aftermath"
 If (Y%4=0 And Y%100) Or Y%400=0
   If M=2 And D=29
     ProcedureReturn "St. Tib's Day, YOLD " + Yold$
   ElseIf DoY>=2*30
     DoY-1
   EndIf
 EndIf
 ProcedureReturn S(DoY/73)+" "+Str(DoY%73)+", Yold "+Yold$

EndProcedure</lang>

Python

<lang python>import datetime, calendar

DISCORDIAN_SEASONS = ["Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"]

def ddate(year, month, day):

   today = datetime.date(year, month, day)
   is_leap_year = calendar.isleap(year)
   if is_leap_year and month == 2 and day == 29:
       return "St. Tib's Day, YOLD " + (year + 1166)
   
   day_of_year = today.timetuple().tm_yday - 1
   
   if is_leap_year and day_of_year >= 60:
       day_of_year -= 1 # Compensate for St. Tib's Day
   
   season, dday = divmod(day_of_year, 73)
   return "%s %d, YOLD %d" % (DISCORDIAN_SEASONS[season], dday + 1, year + 1166)

</lang>

Racket

Translation of: D

<lang racket>#lang racket/base

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Derived from 'D' Implementation ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

(require racket/date racket/match)

(define seasons '(Chaos Discord Confusion Bureaucracy |The Aftermath|)) (define weekday '(Sweetmorn Boomtime Pungenday Prickle-Prickle |Setting Orange|)) (define apostle '(Mungday Mojoday Syaday Zaraday Maladay)) (define holiday '(Chaoflux Discoflux Confuflux Bureflux Afflux))

(define (ymd->date y m d) (seconds->date (find-seconds 0 0 0 d m y))) (define (leap-year? y) (with-handlers ((exn? (λ (x) #f))) (= 29 (date-day (ymd->date y 2 29)))))

(define (discordian-date d)

 (define leap? (leap-year? (date-year d)))
 (define year-day (match* (leap? (date-year-day d))
                    [(#t (? (λ (D) (>= D 59)) d0)) d0]
                    [(_ d0) (add1 d0)]))
 
 (define season-day (modulo year-day 73)) ; season day
 (define (list-ref-season l)
   (define season-index (quotient year-day 73))
   (symbol->string (list-ref l season-index)))
 
 (string-append
  (match* (season-day leap? (date-month d) (date-day d))
    [( _ #t 2 29) "St. Tib's Day,"]
    [((app (match-lambda
             (5 apostle) (50 holiday) (_ #f))
           (and (not #f) special)) _ _  _)
     (string-append (list-ref-season special) ",")]
    [( _  _ _  _)
     (define week-day-name (list-ref weekday (modulo (sub1 year-day) 5)))
     (format "~a, day ~a of ~a" week-day-name season-day (list-ref-season seasons))])
  " in the YOLD " (number->string (+ (date-year d) 1166))))

(displayln (discordian-date (current-date)))

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ passing these tests makes me consistent with D implementation

(module+ test

 (require rackunit)
 (define discordian/ymd (compose discordian-date ymd->date))
 (check-equal? (discordian/ymd 2010 7 22) "Pungenday, day 57 of Confusion in the YOLD 3176")
 (check-equal? (discordian/ymd 2012 2 28) "Prickle-Prickle, day 59 of Chaos in the YOLD 3178")
 (check-equal? (discordian/ymd 2012 2 29) "St. Tib's Day, in the YOLD 3178");
 (check-equal? (discordian/ymd 2012 3  1) "Setting Orange, day 60 of Chaos in the YOLD 3178")
 (check-equal? (discordian/ymd 2010 1  5) "Mungday, in the YOLD 3176")
 (check-equal? (discordian/ymd 2011 5  3) "Discoflux, in the YOLD 3177"))

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~FIN</lang>

Output:

Pungenday, day 47 of Confusion in the YOLD 3179

Raku

(formerly Perl 6)

Works with: rakudo version 2015-11-04

<lang perl6>my @seasons = << Chaos Discord Confusion Bureaucracy 'The Aftermath' >>; my @days = << Sweetmorn Boomtime Pungenday Prickle-Prickle 'Setting Orange' >>; sub ordinal ( Int $n ) { $n ~ ( $n % 100 == 11|12|13

   ?? 'th' !! < th st nd rd th th th th th th >[$n % 10] ) }

sub ddate ( Str $ymd ) {

   my $d = DateTime.new: "{$ymd}T00:00:00Z" or die;

   my $yold = 'in the YOLD ' ~ $d.year + 1166;

   my $day_of_year0 = $d.day-of-year - 1;

   if $d.is-leap-year {
       return "St. Tib's Day, $yold" if $d.month == 2 and $d.day == 29;
       $day_of_year0-- if $day_of_year0 >= 60; # Compensate for St. Tib's Day
   }

   my $weekday    = @days[    $day_of_year0 mod  5     ];
   my $season     = @seasons[ $day_of_year0 div 73     ];
   my $season_day = ordinal(  $day_of_year0 mod 73 + 1 );

   return "$weekday, the $season_day day of $season $yold";

}

say "$_ is {.&ddate}" for < 2010-07-22 2012-02-28 2012-02-29 2012-03-01 >; </lang>

Output:

2010-07-22 is Pungenday, the 57th day of Confusion in the YOLD 3176
2012-02-28 is Prickle-Prickle, the 59th day of Chaos in the YOLD 3178
2012-02-29 is St. Tib's Day, in the YOLD 3178
2012-03-01 is Setting Orange, the 60th day of Chaos in the YOLD 3178

REXX

This REXX version allows the mm or dd to be one or two digits.

Also, the year can be two or four digits, or it may be omitted.

If the Gregorian date is omitted or specified as an asterisk (*), the current date is used. <lang rexx>/*REXX program converts a mm/dd/yyyy Gregorian date ───► a Discordian date. */

@day.1= 'Sweetness'                             /*define the 1st day─of─Discordian─week*/
@day.2= 'Boomtime'                              /*   "    "  2nd  "   "      "       " */
@day.3= 'Pungenday'                             /*   "    "  3rd  "   "      "       " */
@day.4= 'Prickle-Prickle'                       /*   "    "  4th  "   "      "       " */
@day.5= 'Setting Orange'                        /*   "    "  5th  "   "      "       " */

@seas.0= "St. Tib's day," /*define the leap─day of Discordian yr.*/ @seas.1= 'Chaos' /* " 1st season─of─Discordian─year.*/ @seas.2= 'Discord' /* " 2nd " " " " */ @seas.3= 'Confusion' /* " 3rd " " " " */ @seas.4= 'Bureaucracy' /* " 4th " " " " */ @seas.5= 'The Aftermath' /* " 5th " " " " */

parse arg gM '/' gD "/" gY . /*obtain the specified Gregorian date. */ if gM== | gM=="," | gM=='*' then parse value date("U") with gM '/' gD "/" gY .

gY=left( right( date(), 4), 4 - length(Gy) )gY /*adjust for two─digit year or no year.*/

                                                /* [↓]  day─of─year,  leapyear adjust. */

doy= date('d', gY || right(gM, 2, 0)right(gD ,2, 0), "s") - (leapyear(gY) & gM>2)

dW= doy//5; if dW==0 then dW= 5 /*compute the Discordian weekday. */ dS= (doy-1) % 73 + 1 /* " " " season. */ dD= doy//73; if dD==0 then dD= 73 /* " " " day─of─month. */ if leapyear(gY) & gM==2 & gD==29 then ds= 0 /*is this St. Tib's day (leapday) ? */ if ds==0 then dD= /*adjust for the Discordian leap day. */

say space(@day.dW',' @seas.dS dD"," gY + 1166) /*display Discordian date to terminal. */ exit /*stick a fork in it, we're all done. */ /*──────────────────────────────────────────────────────────────────────────────────────*/ leapyear: procedure; parse arg y /*obtain a four─digit Gregorian year. */

         if y//4  \==  0  then return 0         /*Not  ÷  by 4?   Then not a leapyear. */
         return y//100 \== 0  |  y//400 == 0    /*apply the  100  and  400  year rules.*/</lang>

input when using the (various) following inputs of:

output when using the above (various) inputs:

Prickle-Prickle, Chaos 59, 3178
Setting Orange, St. Tib's day, 3178
Setting Orange, Chaos 60, 3178
Pungenday, Confusion 57, 3176
Setting Orange, Bureaucracy 26, 3178
Setting Orange, The Aftermath 73, 3177
Boomtime, Bureaucracy 73, 3181
Setting Orange, The Aftermath 73, 3266

Ruby

<lang ruby>require 'date'

class DiscordianDate

 SEASON_NAMES = ["Chaos","Discord","Confusion","Bureaucracy","The Aftermath"]
 DAY_NAMES = ["Sweetmorn","Boomtime","Pungenday","Prickle-Prickle","Setting Orange"]
 YEAR_OFFSET = 1166
 DAYS_PER_SEASON = 73
 DAYS_PER_WEEK = 5
 ST_TIBS_DAY_OF_YEAR = 60

 def initialize(year, month, day)
   gregorian_date = Date.new(year, month, day)
   @day_of_year = gregorian_date.yday

   @st_tibs = false
   if gregorian_date.leap?
     if @day_of_year == ST_TIBS_DAY_OF_YEAR
       @st_tibs = true
     elsif @day_of_year > ST_TIBS_DAY_OF_YEAR
       @day_of_year -= 1
     end
   end

   @season, @day = (@day_of_year-1).divmod(DAYS_PER_SEASON)
   @day += 1     #←              ↑ fixes of-by-one error (only visible at season changes)
   @year = gregorian_date.year + YEAR_OFFSET
 end
 attr_reader :year, :day

 def season
   SEASON_NAMES[@season]
 end

 def weekday
   if @st_tibs
     "St. Tib's Day"
   else
     DAY_NAMES[(@day_of_year - 1) % DAYS_PER_WEEK]
   end
 end

 def to_s
   %Q{#{@st_tibs ? "St. Tib's Day" : "%s, %s %d" % [weekday, season, day]}, #{year} YOLD}
 end

end</lang>

Testing: <lang ruby>[[2012, 2, 28], [2012, 2, 29], [2012, 3, 1], [2011, 10, 5], [2015, 10, 19]].each do |date|

 dd = DiscordianDate.new(*date)
 puts "#{"%4d-%02d-%02d" % date} => #{dd}"

end</lang>

Output:

2012-02-28 => Prickle-Prickle, Chaos 59, 3178 YOLD
2012-02-29 => St. Tib's Day, 3178 YOLD
2012-03-01 => Setting Orange, Chaos 60, 3178 YOLD
2011-10-05 => Pungenday, Bureaucracy 59, 3177 YOLD
2015-10-19 => Boomtime, Bureaucracy 73, 3181 YOLD

Rust

Compiler: Rust (1.21.0)

Library: chrono

Library: ddate

This example is taken in large part from the ddate crate and used with the permission of the author.

<lang rust>extern crate chrono;

use chrono::NaiveDate; use std::str::FromStr;

fn main() {

   let date = std::env::args().nth(1).expect("Please provide a YYYY-MM-DD date.");
   println!("{} is {}", date, NaiveDate::from_str(&date).unwrap().to_poee());

}

// The necessary constants for the seasons, weekdays, and holydays. const APOSTLES: [&str; 5] = ["Mungday", "Mojoday", "Syaday", "Zaraday", "Maladay"]; const HOLYDAYS: [&str; 5] = ["Chaoflux", "Discoflux", "Confuflux", "Bureflux", "Afflux"]; const SEASONS: [&str; 5] = ["Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"]; const WEEKDAYS: [&str; 5] = ["Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange"];

// The necessary constants for the conversion. const APOSTLE_HOLYDAY: usize = 5; const CURSE_OF_GREYFACE: i32 = 1166; const SEASON_DAYS: usize = 73; const SEASON_HOLYDAY: usize = 50; const ST_TIBS_DAY: usize = 59; const WEEK_DAYS: usize = 5;

// This extends the `Datelike` trait of Rust's Chrono crate with a method that // prints any Datelike type as a String. impl<T: Datelike> DiscordianDate for T {} pub trait DiscordianDate: Datelike {

   fn to_poee(&self) -> String {
       let day = self.ordinal0() as usize;
       let leap = self.year() % 4 == 0 && self.year() % 100 != 0 || self.year() % 400 == 0;
       let year = self.year() + CURSE_OF_GREYFACE;

       if leap && day == ST_TIBS_DAY { return format!("St. Tib's Day, in the YOLD {}", year); }

       let day_offset = if leap && day > ST_TIBS_DAY { day - 1 } else { day };

       let day_of_season = day_offset % SEASON_DAYS + 1;

       let season = SEASONS[day_offset / SEASON_DAYS];
       let weekday = WEEKDAYS[day_offset % WEEK_DAYS];

       let holiday = if day_of_season == APOSTLE_HOLYDAY {
           format!("\nCelebrate {}", APOSTLES[day_offset / SEASON_DAYS])
       } else if day_of_season == SEASON_HOLYDAY {
           format!("\nCelebrate {}", HOLYDAYS[day_offset / SEASON_DAYS])
       } else {
           String::with_capacity(0)
       };

       format!("{}, the {} day of {} in the YOLD {}{}",
           weekday, ordinalize(day_of_season), season, year, holiday)
   }

}

/// A helper function to ordinalize a numeral. fn ordinalize(num: usize) -> String {

   let s = format!("{}", num);

   let suffix = if s.ends_with('1') && !s.ends_with("11") {
       "st"
   } else if s.ends_with('2') && !s.ends_with("12") {
       "nd"
   } else if s.ends_with('3') && !s.ends_with("13") {
       "rd"
   } else {
       "th"
   };

   format!("{}{}", s, suffix)

} </lang>

Output:

$ ./ddate -1166-1-1

-1166-1-1 is Sweetmorn, the 1st day of Chaos in the YOLD 0 $ ./ddate 2000-2-28 2000-2-28 is Prickle-Prickle, the 59th day of Chaos in the YOLD 3166 $ ./ddate -4004-2-29 -4004-2-29 is St. Tib's Day, in the YOLD -2838 $ ./ddate 1066-2-28 1066-2-28 is Prickle-Prickle, the 59th day of Chaos in the YOLD 2232 $ ./ddate 1492-3-1 1492-3-1 is Setting Orange, the 60th day of Chaos in the YOLD 2658 $ ./ddate 1492-9-26 1492-9-26 is Prickle-Prickle, the 50th day of Bureaucracy in the YOLD 2658 Celebrate Bureflux $ ./ddate 2012-10-24 2012-10-24 is Boomtime, the 5th day of The Aftermath in the YOLD 3178 Celebrate Maladay $

Scala

Translation of: Python

<lang scala>package rosetta

import java.util.GregorianCalendar import java.util.Calendar

object DDate extends App {

 private val DISCORDIAN_SEASONS = Array("Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath")
 
 // month from 1-12; day from 1-31
 def ddate(year: Int, month: Int, day: Int): String = {
   val date = new GregorianCalendar(year, month - 1, day)
   val dyear = year + 1166

   val isLeapYear = date.isLeapYear(year)
   if (isLeapYear && month == 2 && day == 29) // 2 means February
     "St. Tib's Day " + dyear + " YOLD"
   else {
     var dayOfYear = date.get(Calendar.DAY_OF_YEAR) - 1
     if (isLeapYear && dayOfYear >= 60)
       dayOfYear -= 1 // compensate for St. Tib's Day

     val dday = dayOfYear % 73
     val season = dayOfYear / 73
     "%s %d, %d YOLD".format(DISCORDIAN_SEASONS(season), dday + 1, dyear)
   }
 }
 if (args.length == 3)
   println(ddate(args(2).toInt, args(1).toInt, args(0).toInt))
 else if (args.length == 0) {
   val today = Calendar.getInstance
   println(ddate(today.get(Calendar.YEAR), today.get(Calendar.MONTH)+1, today.get(Calendar.DAY_OF_MONTH)))
 } else
   println("usage: DDate [day month year]")

}</lang> Test: <lang scala>scala rosetta.DDate 2010 7 22 Confusion 57, 3176 YOLD scala rosetta.DDate 28 2 2012 Chaos 59, 3178 YOLD scala rosetta.DDate 29 2 2012 St. Tib's Day 3178 YOLD scala rosetta.DDate 1 3 2012 Chaos 60, 3178 YOLD scala rosetta.DDate 19 10 2015 Bureaucracy 73, 3181 YOLD </lang>

Seed7

<lang seed7>$ include "seed7_05.s7i";

 include "time.s7i";

const array string: seasons is [0] ("Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"); const array string: weekday is [0] ("Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange"); const array string: apostle is [0] ("Mungday", "Mojoday", "Syaday", "Zaraday", "Maladay"); const array string: holiday is [0] ("Chaoflux", "Discoflux", "Confuflux", "Bureflux", "Afflux");

const func string: discordianDate (in time: date) is func

 result
   var string: discordianDate is "";
 local
   var integer: dyear is 0;
   var integer: doy is 0;
   var integer: dsday is 0;
 begin
   dyear := date.year + 1166;
   if isLeapYear(date.year) and date.month = 2 and date.day = 29 then
     discordianDate := "St. Tib's Day, in the YOLD " <& dyear;
   else
     doy := dayOfYear(date);
     if isLeapYear(date.year) and doy >= 60 then
       decr(doy);
     end if;
     dsday := doy rem 73; # season day
     if dsday = 5 then
       discordianDate := apostle[doy div 73] <& ", in the YOLD " <& dyear;
     elsif dsday = 50 then
       discordianDate := holiday[doy div 73] <& ", in the YOLD " <& dyear;
     else
       discordianDate := weekday[pred(doy) rem 5] <&
                         ", day " <& dsday <&
                         " of " <& seasons[doy div 73] <&
                         " in the YOLD " <& dyear;
     end if;
   end if;
 end func;

const proc: main is func

 local
   var time: today is time.value;
 begin
   today := time(NOW);
   writeln(strDate(today) <& " as Discordian date: " <& discordianDate(today));
   if  discordianDate(date(2010, 7, 22)) = "Pungenday, day 57 of Confusion in the YOLD 3176" and
       discordianDate(date(2012, 2, 28)) = "Prickle-Prickle, day 59 of Chaos in the YOLD 3178" and
       discordianDate(date(2012, 2, 29)) = "St. Tib's Day, in the YOLD 3178" and
       discordianDate(date(2012, 3,  1)) = "Setting Orange, day 60 of Chaos in the YOLD 3178" and
       discordianDate(date(2010, 1,  5)) = "Mungday, in the YOLD 3176" and
       discordianDate(date(2011, 5,  3)) = "Discoflux, in the YOLD 3177" then
     writeln("Discordian date computation works.");
   end if;
 end func;</lang>

Output:

2013-05-12 as Discordian date: Boomtime, day 59 of Discord in the YOLD 3179
Discordian date computation works.

Sidef

Translation of: Perl

<lang ruby>require('Time::Piece');

var seasons = %w(Chaos Discord Confusion Bureaucracy The\ Aftermath); var week_days = %w(Sweetmorn Boomtime Pungenday Prickle-Prickle Setting\ Orange);

func ordinal (n) {

   "#{n}" + (n % 100 ~~ [11,12,13] ? 'th'

: [n % 10])

}

func ddate(ymd) {

   var d = %s'Time::Piece'.strptime(ymd, '%Y-%m-%d');
   var yold = "in the YOLD #{d.year + 1166}";

   var day_of_year0 = d.day_of_year;

   if (d.is_leap_year) {
       return "St. Tib's Day, #{yold}" if ([d.mon, d.mday] == [2, 29]);
       day_of_year0-- if (day_of_year0 >= 60); # Compensate for St. Tib's Day
   }

   var weekday = week_days[day_of_year0 % week_days.len];
   var season = seasons[day_of_year0 / 73];
   var season_day = ordinal(day_of_year0 % 73 + 1);

   return "#{weekday}, the #{season_day} day of #{season} #{yold}";

}

%w(2010-07-22 2012-02-28 2012-02-29 2012-03-01).each { |ymd|

   say "#{ymd} is #{ddate(ymd)}"

}</lang>

Output:

2010-07-22 is Pungenday, the 57th day of Confusion in the YOLD 3176
2012-02-28 is Prickle-Prickle, the 59th day of Chaos in the YOLD 3178
2012-02-29 is St. Tib's Day, in the YOLD 3178
2012-03-01 is Setting Orange, the 60th day of Chaos in the YOLD 3178

Swift

<lang swift>import Foundation

let monthDays = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334] let seasons = ["Chaos", "Discord", "Confusion", "Bureacracy", "The Aftermath"] let dayNames = ["Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange"] let holyDays1 = ["Mungday", "Mojoday", "Syaday", "Zaraday", "Maladay"] let holyDays2 = ["Chaoflux", "Discoflux", "Confuflux", "Bureflux", "Afflux"]

func discordianDate(date: Date) -> String {

   let calendar = Calendar.current
   let year = calendar.component(.year, from: date)
   let month = calendar.component(.month, from: date)
   let day = calendar.component(.day, from: date)
   let discYear = year + 1166
   if month == 2 && day == 29 {
       return "St. Tib's Day in the YOLD \(discYear)"
   }
   let dayOfYear = monthDays[month - 1] + day - 1
   let season = dayOfYear/73
   let weekDay = dayOfYear % 5
   let dayOfSeason = 1 + dayOfYear % 73
   let ddate = "\(dayNames[weekDay]), day \(dayOfSeason) of \(seasons[season]) in the YOLD \(discYear)"
   switch (dayOfSeason) {
   case 5:
       return ddate + ". Celebrate \(holyDays1[season])!"
   case 50:
       return ddate + ". Celebrate \(holyDays2[season])!"
   default:
       return ddate
   }

}

func showDiscordianDate(year: Int, month: Int, day: Int) {

   let calendar = Calendar.current
   let date = calendar.date(from: DateComponents(year: year, month: month, day: day))!
   let ddate = discordianDate(date: date)
   let format = DateFormatter()
   format.dateFormat = "yyyy-MM-dd"
   print("\(format.string(from: date)): \(ddate)")

}

showDiscordianDate(year: 2022, month: 1, day: 20) showDiscordianDate(year: 2020, month: 9, day: 21) showDiscordianDate(year: 2020, month: 2, day: 29) showDiscordianDate(year: 2019, month: 7, day: 15) showDiscordianDate(year: 2025, month: 3, day: 19) showDiscordianDate(year: 2017, month: 12, day: 8)</lang>

Output:

2022-01-20: Setting Orange, day 20 of Chaos in the YOLD 3188
2020-09-21: Prickle-Prickle, day 45 of Bureacracy in the YOLD 3186
2020-02-29: St. Tib's Day in the YOLD 3186
2019-07-15: Sweetmorn, day 50 of Confusion in the YOLD 3185. Celebrate Confuflux!
2025-03-19: Pungenday, day 5 of Discord in the YOLD 3191. Celebrate Mojoday!
2017-12-08: Boomtime, day 50 of The Aftermath in the YOLD 3183. Celebrate Afflux!

Tcl

<lang tcl>package require Tcl 8.5 proc disdate {year month day} {

   # Get the day of the year
   set now [clock scan [format %02d-%02d-%04d $day $month $year] -format %d-%m-%Y]
   scan [clock format $now -format %j] %d doy

   # Handle leap years
   if {!($year%4) && (($year%100) || !($year%400))} {

if {$doy == 60} { return "St. Tib's Day, [expr {$year + 1166}] YOLD" } elseif {$doy > 60} { incr doy -1 }

   # Main conversion to discordian format now that special cases are handled
   incr doy -1; # Allow div/mod to work right
   set season [lindex {Chaos Discord Confusion Bureaucracy {The Aftermath}} \

[expr {$doy / 73}]]

   set dos [expr {$doy % 73 + 1}]
   incr year 1166
   return "$season $dos, $year YOLD"

}</lang> Demonstrating: <lang tcl>puts [disdate 2010 7 22]; # Today puts [disdate 2012 2 28] puts [disdate 2012 2 29] puts [disdate 2012 3 1]</lang>

Output:

Confusion 57, 3176 YOLD
Chaos 59, 3178 YOLD
St. Tib's Day, 3178 YOLD
Chaos 60, 3178 YOLD

Wren

Translation of: C#

Library: Wren-date

Library: Wren-fmt

<lang ecmascript>import "/date" for Date import "/fmt" for Fmt

var seasons = ["Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"] var weekdays = ["Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange"] var apostles = ["Mungday", "Mojoday", "Syaday", "Zaraday", "Maladay"] var holidays = ["Chaoflux", "Discoflux", "Confuflux", "Bureflux", "Afflux"]

var discordian = Fn.new { |date|

   var y = date.year
   var yold = " in the YOLD %(y + 1166)."
   var doy = date.dayOfYear
   if (Date.isLeapYear(y)) {
       if (doy == 60) return "St. Tib's Day" + yold
       if (doy > 60) doy = doy - 1
   }
   doy = doy - 1
   var seasonDay = doy % 73 + 1
   var seasonNr = (doy/73).floor
   var weekdayNr = doy % 5
   var holyday = ""
   if (seasonDay == 5)  holyday = " Celebrate %(apostles[seasonNr])!"
   if (seasonDay == 50) holyday = " Celebrate %(holidays[seasonNr])!"
   var season = seasons[seasonNr]
   var dow = weekdays[weekdayNr]
   return Fmt.swrite("$s, day $s of $s$s$s", dow, seasonDay, season, yold, holyday)

}

var dates = [

  "2010-01-01",
  "2010-01-05",
  "2011-02-19",
  "2012-02-28",
  "2012-02-29",
  "2012-03-01",
  "2013-03-19",
  "2014-05-03",
  "2015-05-31",
  "2016-06-22",
  "2016-07-15",
  "2017-08-12",
  "2018-09-19",
  "2018-09-26",
  "2019-10-24",
  "2020-12-08",
  "2020-12-31"

]

for (date in dates) {

   var dt = Date.parse(date)
   System.print("%(date) = %(discordian.call(dt))")

}</lang>

Output:

2010-01-01 = Sweetmorn, day 1 of Chaos in the YOLD 3176. 
2010-01-05 = Setting Orange, day 5 of Chaos in the YOLD 3176. Celebrate Mungday!
2011-02-19 = Setting Orange, day 50 of Chaos in the YOLD 3177. Celebrate Chaoflux!
2012-02-28 = Prickle-Prickle, day 59 of Chaos in the YOLD 3178. 
2012-02-29 = St. Tib's Day in the YOLD 3178.
2012-03-01 = Setting Orange, day 60 of Chaos in the YOLD 3178. 
2013-03-19 = Pungenday, day 5 of Discord in the YOLD 3179. Celebrate Mojoday!
2014-05-03 = Pungenday, day 50 of Discord in the YOLD 3180. Celebrate Discoflux!
2015-05-31 = Sweetmorn, day 5 of Confusion in the YOLD 3181. Celebrate Syaday!
2016-06-22 = Pungenday, day 27 of Confusion in the YOLD 3182. 
2016-07-15 = Sweetmorn, day 50 of Confusion in the YOLD 3182. Celebrate Confuflux!
2017-08-12 = Prickle-Prickle, day 5 of Bureaucracy in the YOLD 3183. Celebrate Zaraday!
2018-09-19 = Boomtime, day 43 of Bureaucracy in the YOLD 3184. 
2018-09-26 = Prickle-Prickle, day 50 of Bureaucracy in the YOLD 3184. Celebrate Bureflux!
2019-10-24 = Boomtime, day 5 of The Aftermath in the YOLD 3185. Celebrate Maladay!
2020-12-08 = Boomtime, day 50 of The Aftermath in the YOLD 3186. Celebrate Afflux!
2020-12-31 = Setting Orange, day 73 of The Aftermath in the YOLD 3186.

zkl

Translation of: D

<lang zkl>fcn discordianDate(y,m,d){

  var [const]
  seasons=T("Chaos","Discord","Confusion","Bureaucracy","The Aftermath"),
  weekday=T("Sweetmorn","Boomtime","Pungenday","Prickle-Prickle","Setting Orange"),
  apostle=T("Mungday","Mojoday","Syaday","Zaraday","Maladay"),
  holiday=T("Chaoflux","Discoflux","Confuflux","Bureflux","Afflux"];

  dYear,isLeapYear := y + 1166, Time.Date.isLeapYear(y);
  if(isLeapYear and m==2 and d==29)
     return("St. Tib's Day, in the YOLD " + dYear);

   doy:=Time.Date.nthDayInYear(y,m,d);
   if(isLeapYear and doy>=60) doy-=1;
   dsDay:=(if(doy%73==0) 73 else doy%73); // Season day.
   if(dsDay==5)  return(String(apostle[doy/73],", in the YOLD ",dYear));
   if(dsDay==50) return(String(holiday[doy/73],", in the YOLD ",dYear));

   dSeas:=seasons[(if(doy%73==0) doy-1 else doy)/73];
   dWday:=weekday[(doy - 1)%5];
   "%s, day %s of %s in the YOLD %s".fmt(dWday,dsDay,dSeas,dYear);

}</lang> <lang zkl>foreach y,m,d in (T(T(2010,7,22), T(2012,2,28), T(2012,2,29), T(2012,3,1), T(2010,1, 5), T(2011,5, 3))){

  "%d-%02d-%02d is -->%s".fmt(y,m,d,discordianDate(y,m,d)).println();

}</lang>

Output:

2010-07-22 is -->Pungenday, day 57 of Confusion in the YOLD 3176
2012-02-28 is -->Prickle-Prickle, day 59 of Chaos in the YOLD 3178
2012-02-29 is -->St. Tib's Day, in the YOLD 3178
2012-03-01 is -->Setting Orange, day 60 of Chaos in the YOLD 3178
2010-01-05 is -->Mungday, in the YOLD 3176
2011-05-03 is -->Discoflux, in the YOLD 3177

@@ Line 3,627: / Line 3,627: @@
 =={{header|Phix}}==
+<!--<lang Phix>(phixonline)-->
-<lang Phix>constant seasons = {"Chaos", "Discord", "Confusion", "Bureaucracy", "The Aftermath"}
+ <span style="color: #008080;">with</span> <span style="color: #008080;">javascript_semantics</span>
-constant weekday = {"Sweetmorn", "Boomtime", "Pungenday", "Prickle-Prickle", "Setting Orange"}
+ <span style="color: #008080;">constant</span> <span style="color: #000000;">seasons</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #008000;">"Chaos"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Discord"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Confusion"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Bureaucracy"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"The Aftermath"</span><span style="color: #0000FF;">},</span>
-constant apostle = {"Mungday", "Mojoday", "Syaday", "Zaraday", "Maladay"}
+          <span style="color: #000000;">weekday</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #008000;">"Sweetmorn"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Boomtime"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Pungenday"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Prickle-Prickle"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Setting Orange"</span><span style="color: #0000FF;">},</span>
-constant holiday = {"Chaoflux", "Discoflux", "Confuflux", "Bureflux", "Afflux"}
+          <span style="color: #000000;">apostle</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #008000;">"Mungday"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Mojoday"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Syaday"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Zaraday"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Maladay"</span><span style="color: #0000FF;">},</span>
+          <span style="color: #000000;">holiday</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #008000;">"Chaoflux"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Discoflux"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Confuflux"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Bureflux"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Afflux"</span><span style="color: #0000FF;">}</span>
+ <span style="color: #008080;">function</span> <span style="color: #000000;">discordianDate</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">dt</span><span style="color: #0000FF;">)</span>
+     <span style="color: #004080;">integer</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">y</span><span style="color: #0000FF;">,</span><span style="color: #000000;">m</span><span style="color: #0000FF;">,</span><span style="color: #000000;">d</span><span style="color: #0000FF;">}</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">dt</span><span style="color: #0000FF;">,</span>
+             <span style="color: #000000;">leap</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">is_leap_year</span><span style="color: #0000FF;">(</span><span style="color: #000000;">y</span><span style="color: #0000FF;">),</span>
+             <span style="color: #000000;">doy</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">day_of_year</span><span style="color: #0000FF;">(</span><span style="color: #000000;">y</span><span style="color: #0000FF;">,</span><span style="color: #000000;">m</span><span style="color: #0000FF;">,</span><span style="color: #000000;">d</span><span style="color: #0000FF;">)-</span><span style="color: #000000;">1</span>
+     <span style="color: #004080;">string</span> <span style="color: #000000;">dyear</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">sprintf</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"%d"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">y</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1166</span><span style="color: #0000FF;">)</span>
+     <span style="color: #008080;">if</span> <span style="color: #000000;">leap</span> <span style="color: #008080;">and</span> <span style="color: #000000;">m</span><span style="color: #0000FF;">=</span><span style="color: #000000;">2</span> <span style="color: #008080;">and</span> <span style="color: #000000;">d</span><span style="color: #0000FF;">=</span><span style="color: #000000;">29</span> <span style="color: #008080;">then</span>
+         <span style="color: #008080;">return</span> <span style="color: #008000;">"St. Tib's Day, in the YOLD "</span> <span style="color: #0000FF;">&</span> <span style="color: #000000;">dyear</span>
+     <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
+     <span style="color: #008080;">if</span> <span style="color: #000000;">leap</span> <span style="color: #008080;">and</span> <span style="color: #000000;">doy</span><span style="color: #0000FF;">>=</span><span style="color: #000000;">60</span> <span style="color: #008080;">then</span>
+         <span style="color: #000000;">doy</span> <span style="color: #0000FF;">-=</span> <span style="color: #000000;">1</span>
+     <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
+     <span style="color: #004080;">integer</span> <span style="color: #000000;">dsday</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">remainder</span><span style="color: #0000FF;">(</span><span style="color: #000000;">doy</span><span style="color: #0000FF;">,</span><span style="color: #000000;">73</span><span style="color: #0000FF;">)+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span>
+             <span style="color: #000000;">dseason</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">floor</span><span style="color: #0000FF;">(</span><span style="color: #000000;">doy</span><span style="color: #0000FF;">/</span><span style="color: #000000;">73</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)</span>
+     <span style="color: #008080;">if</span> <span style="color: #000000;">dsday</span><span style="color: #0000FF;">=</span><span style="color: #000000;">5</span> <span style="color: #008080;">then</span>
+         <span style="color: #008080;">return</span> <span style="color: #000000;">apostle</span><span style="color: #0000FF;">[</span><span style="color: #000000;">dseason</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">&</span> <span style="color: #008000;">", in the YOLD "</span> <span style="color: #0000FF;">&</span> <span style="color: #000000;">dyear</span>
+     <span style="color: #008080;">elsif</span> <span style="color: #000000;">dsday</span><span style="color: #0000FF;">=</span><span style="color: #000000;">50</span> <span style="color: #008080;">then</span>
+         <span style="color: #008080;">return</span> <span style="color: #000000;">holiday</span><span style="color: #0000FF;">[</span><span style="color: #000000;">dseason</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">&</span> <span style="color: #008000;">", in the YOLD "</span> <span style="color: #0000FF;">&</span> <span style="color: #000000;">dyear</span>
+     <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
+     <span style="color: #004080;">string</span> <span style="color: #000000;">dseas</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">seasons</span><span style="color: #0000FF;">[</span><span style="color: #000000;">dseason</span><span style="color: #0000FF;">],</span>
+            <span style="color: #000000;">dwday</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">weekday</span><span style="color: #0000FF;">[</span><span style="color: #7060A8;">remainder</span><span style="color: #0000FF;">(</span><span style="color: #000000;">doy</span><span style="color: #0000FF;">,</span><span style="color: #000000;">5</span><span style="color: #0000FF;">)+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span>
+     <span style="color: #008080;">return</span> <span style="color: #7060A8;">sprintf</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"%s, day %d of %s in the YOLD %s"</span><span style="color: #0000FF;">,</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">dwday</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">dsday</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">dseas</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">dyear</span><span style="color: #0000FF;">})</span>
+ <span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
+ <span style="color: #000080;font-style:italic;">-- test code</span>
-function discordianDate(sequence dt)
-string dyear, dseas, dwday
-integer  leap, doy, dsday,dseason
-integer {y,m,d} = dt
-    dyear = sprintf("%d",y+1166)
-    leap = is_leap_year(y)
-    if leap and m=2 and d=29 then
-        return "St. Tib's Day, in the YOLD " & dyear
-    end if
+ <span style="color: #004080;">sequence</span> <span style="color: #000000;">dt</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">2015</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">0</span><span style="color: #0000FF;">,</span><span style="color: #000000;">0</span><span style="color: #0000FF;">,</span><span style="color: #000000;">0</span><span style="color: #0000FF;">,</span><span style="color: #000000;">0</span><span style="color: #0000FF;">,</span><span style="color: #000000;">0</span><span style="color: #0000FF;">}</span>
-    doy = day_of_year(y,m,d)-1
+ <span style="color: #008080;">include</span> <span style="color: #004080;">timedate</span><span style="color: #0000FF;">.</span><span style="color: #000000;">e</span>
-    if leap and doy>=60 then
+ <span style="color: #004080;">atom</span> <span style="color: #000000;">oneday</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">timedelta</span><span style="color: #0000FF;">(</span><span style="color: #000000;">days</span><span style="color: #0000FF;">:=</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)</span>
-        doy -= 1
+ <span style="color: #7060A8;">set_timedate_formats</span><span style="color: #0000FF;">({</span><span style="color: #008000;">"DD/MM/YYYY"</span><span style="color: #0000FF;">})</span>
-    end if
+ <span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #000000;">5</span> <span style="color: #008080;">do</span>
+     <span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"%s: %s\n"</span><span style="color: #0000FF;">,{</span><span style="color: #7060A8;">format_timedate</span><span style="color: #0000FF;">(</span><span style="color: #000000;">dt</span><span style="color: #0000FF;">),</span><span style="color: #000000;">discordianDate</span><span style="color: #0000FF;">(</span><span style="color: #000000;">dt</span><span style="color: #0000FF;">)})</span>
-    dsday = remainder(doy,73)+1
+     <span style="color: #000000;">dt</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">adjust_timedate</span><span style="color: #0000FF;">(</span><span style="color: #000000;">dt</span><span style="color: #0000FF;">,</span><span style="color: #000000;">oneday</span><span style="color: #0000FF;">*</span><span style="color: #000000;">72</span><span style="color: #0000FF;">)</span>
-    dseason = floor(doy/73+1)
+     <span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"%s: %s\n"</span><span style="color: #0000FF;">,{</span><span style="color: #7060A8;">format_timedate</span><span style="color: #0000FF;">(</span><span style="color: #000000;">dt</span><span style="color: #0000FF;">),</span><span style="color: #000000;">discordianDate</span><span style="color: #0000FF;">(</span><span style="color: #000000;">dt</span><span style="color: #0000FF;">)})</span>
-    if dsday=5 then
+     <span style="color: #000000;">dt</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">adjust_timedate</span><span style="color: #0000FF;">(</span><span style="color: #000000;">dt</span><span style="color: #0000FF;">,</span><span style="color: #000000;">oneday</span><span style="color: #0000FF;">)</span>
-        return apostle[dseason] & ", in the YOLD " & dyear
+ <span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
-    elsif dsday=50 then
+<!--</lang>-->
-        return holiday[dseason] & ", in the YOLD " & dyear
-    end if
-    dseas = seasons[dseason]
-    dwday = weekday[remainder(doy,5)+1]
-    return sprintf("%s, day %d of %s in the YOLD %s", {dwday, dsday, dseas, dyear})
-end function</lang>
-test code
-<lang Phix>sequence dt = {2015,1,1,0,0,0,0,0}
-include timedate.e
-atom oneday = timedelta(days:=1)
-set_timedate_formats({"DD/MM/YYYY: "})
-for i=1 to 5 do
-    ?format_timedate(dt)&discordianDate(dt)
-    dt = adjust_timedate(dt,oneday*72)
-    ?format_timedate(dt)&discordianDate(dt)
-    dt = adjust_timedate(dt,oneday)
-end for</lang>
 {{out}}
 <pre>