Long year: Difference between revisions

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Long years in the 22nd century:{2105,2111,2116,2122,2128,2133,2139,2144,2150,2156,2161,2167,2172,2178,2184,2189,2195}
Long years in the 22nd century:{2105,2111,2116,2122,2128,2133,2139,2144,2150,2156,2161,2167,2172,2178,2184,2189,2195}
</pre>
</pre>

=={{header|Python}}==
{{Works with|Python|3.7}}
<lang python>'''Long Year ?'''

from datetime import date


# longYear :: Year Int -> Bool
def longYear(y):
'''True if the ISO year y has 53 weeks.'''
return 52 < date(y, 12, 28).isocalendar()[1]


# --------------------------TEST---------------------------
# main :: IO ()
def main():
'''Test'''
for year in [
x for x in range(2000, 2101)
if longYear(x)
]:
print(year)


# MAIN ---
if __name__ == '__main__':
main()</lang>
{{Out}}
<pre>2004
2009
2015
2020
2026
2032
2037
2043
2048
2054
2060
2065
2071
2076
2082
2088
2093
2099</pre>


=={{header|REXX}}==
=={{header|REXX}}==

Revision as of 23:58, 10 February 2020

Long year is a draft programming task. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page.

Most years have 52 weeks, some have 53, according to ISO8601.


Task

Write a function which determines if a given year is long (53 weeks) or not, and demonstrate it.

AWK

<lang AWK>

  1. syntax: GAWK -f LONG_YEAR.AWK

BEGIN { 

   for (cc=19; cc<=21; cc++) {
     printf("%2d00-%2d99: ",cc,cc)
     for (yy=0; yy<=99; yy++) {
       ccyy = sprintf("%02d%02d",cc,yy)
       if (is_long_year(ccyy)) {
         printf("%4d ",ccyy)
       }
     }
     printf("\n")
   }

   printf("\n%4d-%4d: ",by=1970,ey=2037)
   for (y=by; y<=ey; y++) {
     if (strftime("%V",mktime(sprintf("%d 12 28 0 0 0",y))) == 53) {
       printf("%4d ",y)
     }
   }
   printf("\n")
   exit(0)

} function is_long_year(year, i) { 

   for (i=0; i<=1; i++) {
     year -= i
     if ((year + int(year/4) - int(year/100) + int(year/400)) % 7 == 4-i) {
       return(1)
     }
   }
   return(0)

} </lang>

Output:
1900-1999: 1903 1908 1914 1920 1925 1931 1936 1942 1948 1953 1959 1964 1970 1976 1981 1987 1992 1998
2000-2099: 2004 2009 2015 2020 2026 2032 2037 2043 2048 2054 2060 2065 2071 2076 2082 2088 2093 2099
2100-2199: 2105 2111 2116 2122 2128 2133 2139 2144 2150 2156 2161 2167 2172 2178 2184 2189 2195

1970-2037: 1970 1976 1981 1987 1992 1998 2004 2009 2015 2020 2026 2032 2037

Factor

Works with: Factor version 0.99 2019-10-06

<lang factor>USING: calendar formatting io kernel math.ranges sequences ;

long-year? ( n -- ? ) 12 28 <date> week-number 53 = ;

"Year Long?\n-----------" print 1990 2021 [a,b] [ dup long-year? "yes" "no" ? "%d %s\n" printf ] each</lang>

Output:
Year  Long?
-----------
1990  no
1991  no
1992  yes
1993  no
1994  no
1995  no
1996  no
1997  no
1998  yes
1999  no
2000  no
2001  no
2002  no
2003  no
2004  yes
2005  no
2006  no
2007  no
2008  no
2009  yes
2010  no
2011  no
2012  no
2013  no
2014  no
2015  yes
2016  no
2017  no
2018  no
2019  no
2020  yes
2021  no

Go

<lang go>package main

import ( 

   "fmt"
   "time"

)

func main() { 

   centuries := []string{"20th", "21st", "22nd"}
   starts := []int{1900, 2000, 2100} 
   for i := 0; i < len(centuries); i++ {
       var longYears []int
       fmt.Printf("\nLong years in the %s century:\n", centuries[i])
       for j := starts[i]; j < starts[i] + 100; j++ {
           t := time.Date(j, time.December, 28, 0, 0, 0, 0, time.UTC)
           if _, week := t.ISOWeek(); week == 53 {
               longYears = append(longYears, j)
           }
       }
       fmt.Println(longYears)
   }

}</lang>

Output:
Long years in the 20th century:
[1903 1908 1914 1920 1925 1931 1936 1942 1948 1953 1959 1964 1970 1976 1981 1987 1992 1998]

Long years in the 21st century:
[2004 2009 2015 2020 2026 2032 2037 2043 2048 2054 2060 2065 2071 2076 2082 2088 2093 2099]

Long years in the 22nd century:
[2105 2111 2116 2122 2128 2133 2139 2144 2150 2156 2161 2167 2172 2178 2184 2189 2195]

Java

<lang java> import java.time.LocalDate; import java.time.temporal.WeekFields;

public class LongYear { 

   public static void main(String[] args) {
       System.out.printf("Long years this century:%n");
       for (int year = 2000 ; year < 2100 ; year++ ) {
           if ( longYear(year) ) {
               System.out.print(year + "  ");
           }
       }
   }
   
   private static boolean longYear(int year) {
       return LocalDate.of(year, 12, 28).get(WeekFields.ISO.weekOfYear()) == 53;
   }

} </lang>

Output:
Long years this century:
2004  2009  2015  2020  2026  2032  2037  2043  2048  2054  2060  2065  2071  2076  2082  2088  2093  2099

Julia

<lang julia>using Dates

has53weeks(year) = week(Date(year, 12, 28)) == 53

println(" Year 53 weeks?\n----------------") for year in 1990:2021 

   println(year, "   ", has53weeks(year) ? "Yes" : "No")

end

</lang>

Output:
 Year  53 weeks?
----------------
1990   No
1991   No
1992   Yes
1993   No
1994   No
1995   No
1996   No
1997   No
1998   Yes
1999   No
2000   No
2001   No
2002   No
2003   No
2004   Yes
2005   No
2006   No
2007   No
2008   No
2009   Yes
2010   No
2011   No
2012   No
2013   No
2014   No
2015   Yes
2016   No
2017   No
2018   No
2019   No
2020   Yes
2021   No

Perl

<lang perl>use strict; use warnings; use DateTime;

for my $century (19 .. 21) { 

 for my $year ($century*100 .. ++$century*100 - 1) {
   print "$year " if DateTime->new(year => $year, month => 12, day => 28)->week_number > 52
 }
 print "\n";

}</lang>

Output:
1903 1908 1914 1920 1925 1931 1936 1942 1948 1953 1959 1964 1970 1976 1981 1987 1992 1998
2004 2009 2015 2020 2026 2032 2037 2043 2048 2054 2060 2065 2071 2076 2082 2088 2093 2099
2105 2111 2116 2122 2128 2133 2139 2144 2150 2156 2161 2167 2172 2178 2184 2189 2195

Perl 6

Works with: Rakudo version 2019.11

December 28 is always in the last week of the year. (By ISO8601) <lang perl6>sub is-long ($year) { Date.new("$year-12-28").week[1] == 53 }

  1. Testing

say "Long years in the 20th century:\n", (1900..^2000).grep: *.&is-long; say "\nLong years in the 21st century:\n", (2000..^2100).grep: *.&is-long; say "\nLong years in the 22nd century:\n", (2100..^2200).grep: *.&is-long;</lang>

Output:
Long years in the 20th century:
(1903 1908 1914 1920 1925 1931 1936 1942 1948 1953 1959 1964 1970 1976 1981 1987 1992 1998)

Long years in the 21st century:
(2004 2009 2015 2020 2026 2032 2037 2043 2048 2054 2060 2065 2071 2076 2082 2088 2093 2099)

Long years in the 22nd century:
(2105 2111 2116 2122 2128 2133 2139 2144 2150 2156 2161 2167 2172 2178 2184 2189 2195)

Phix

Requires 0.8.1+ <lang Phix>include builtins\ordinal.e

function week_number(integer y,m,d) 

   integer doy = day_of_year(y,m,d),
           dow = day_of_week(y,m,d),
           week = floor((doy-dow+10)/7)
   return week

end function

for c=20 to 22 do 

   sequence long_years = {}
   integer century = (c-1)*100
   for year=century to century+99 do
       if week_number(year,12,28)=53 then
           long_years &= year
       end if
   end for
   printf(1,"Long years in the %d%s century:%v\n", {c,ord(c),long_years})

end for</lang>

Output:
Long years in the 20th century:{1903,1908,1914,1920,1925,1931,1936,1942,1948,1953,1959,1964,1970,1976,1981,1987,1992,1998}
Long years in the 21st century:{2004,2009,2015,2020,2026,2032,2037,2043,2048,2054,2060,2065,2071,2076,2082,2088,2093,2099}
Long years in the 22nd century:{2105,2111,2116,2122,2128,2133,2139,2144,2150,2156,2161,2167,2172,2178,2184,2189,2195}

Python

Works with: Python version 3.7

<lang python>Long Year ?

from datetime import date


  1. longYear :: Year Int -> Bool

def longYear(y): 

   True if the ISO year y has 53 weeks.
   return 52 < date(y, 12, 28).isocalendar()[1]


  1. --------------------------TEST---------------------------
  2. main :: IO ()

def main(): 

   Test
   for year in [
           x for x in range(2000, 2101)
           if longYear(x)
   ]:
       print(year)


  1. MAIN ---

if __name__ == '__main__': 

   main()</lang>
Output:
2004
2009
2015
2020
2026
2032
2037
2043
2048
2054
2060
2065
2071
2076
2082
2088
2093
2099

REXX

<lang rexx>/*REXX program determines if a (calendar) year is a SHORT or LONG year (52 or 53 weeks).*/ parse arg LO HI . /*obtain optional args. */ if LO== | LO=="," | LO=='*' then LO= left( date('S'), 4) /*Not given? Use default.*/ if HI== | HI=="," then HI= LO /* " " " " */ if HI=='*' then HI= left( date('S'), 4) /*an asterisk ≡ current yr*/ 

    do j=LO  to  HI                             /*process single yr  or range of years.*/
    say '     year '   j   " is a "   right( word('short long', weeks(j)-51),5)   " year"
    end   /*j*/

exit /*stick a fork in it, we're all done. */ /*──────────────────────────────────────────────────────────────────────────────────────*/ pWeek: parse arg yr; return (yr + yr%4 - yr%100 + yr%400) // 7 /*calculate P*/ weeks: parse arg y; $= 52; if pWeek(y)==4 | pWeek(y-1)==3 then $= $ + 1; return $</lang>

output   when using the inputs of:     1990   2030

(Shown at three-quarter size.) 

     year  1990  is a  short  year
     year  1991  is a  short  year
     year  1992  is a   long  year
     year  1993  is a  short  year
     year  1994  is a  short  year
     year  1995  is a  short  year
     year  1996  is a  short  year
     year  1997  is a  short  year
     year  1998  is a   long  year
     year  1999  is a  short  year
     year  2000  is a  short  year
     year  2001  is a  short  year
     year  2002  is a  short  year
     year  2003  is a  short  year
     year  2004  is a   long  year
     year  2005  is a  short  year
     year  2006  is a  short  year
     year  2007  is a  short  year
     year  2008  is a  short  year
     year  2009  is a   long  year
     year  2010  is a  short  year
     year  2011  is a  short  year
     year  2012  is a  short  year
     year  2013  is a  short  year
     year  2014  is a  short  year
     year  2015  is a   long  year
     year  2016  is a  short  year
     year  2017  is a  short  year
     year  2018  is a  short  year
     year  2019  is a  short  year
     year  2020  is a   long  year
     year  2021  is a  short  year
     year  2022  is a  short  year
     year  2023  is a  short  year
     year  2024  is a  short  year
     year  2025  is a  short  year
     year  2026  is a   long  year
     year  2027  is a  short  year
     year  2028  is a  short  year
     year  2029  is a  short  year
     year  2030  is a  short  year

Ruby

<lang ruby> require 'date'

def long_year?(year = Date.today.year) 

 Date.new(year, 12, 28).cweek == 53

end

(2020..2030).each{|year| puts "#{year} is long? #{ long_year?(year) }." } </lang>

Output:
2020 is long? true.
2021 is long? false.
2022 is long? false.
2023 is long? false.
2024 is long? false.
2025 is long? false.
2026 is long? true.
2027 is long? false.
2028 is long? false.
2029 is long? false.
2030 is long? false.

Visual Basic

Works with: Visual Basic version 5
Works with: Visual Basic version 6
Works with: VBA version Access 97
Works with: VBA version 6.5
Works with: VBA version 7.1

<lang vb>Option Explicit

Function IsLongYear(ByVal Year As Integer) As Boolean 

 Select Case vbThursday
 Case VBA.DatePart("w", VBA.DateSerial(Year, 1, 1)), _
      VBA.DatePart("w", VBA.DateSerial(Year, 12, 31))
   IsLongYear = True
 End Select

End Function

Sub Main() 'test Dim l As Long 

 For l = 1990 To 2021
   Select Case l
   Case 1992, 1998, 2004, 2009, 2015, 2020
     Debug.Assert IsLongYear(l)
   Case Else
     Debug.Assert Not IsLongYear(l)
   End Select
 Next l

End Sub </lang>

zkl

<lang zkl>fcn isLongYear(y){ Time.Date.weeksInYear(y)==53 } foreach nm,y in (T(T("20th",1900), T("21st",2000), T("22nd",2100))){ 

  println("\nLong years in the %s century:\n%s".fmt(nm,
     [y..y+99].filter(isLongYear).concat(" ")));

}</lang>

Output:
Long years in the 20th century:
1903 1908 1914 1920 1925 1931 1936 1942 1948 1953 1959 1964 1970 1976 1981 1987 1992 1998

Long years in the 21st century:
2004 2009 2015 2020 2026 2032 2037 2043 2048 2054 2060 2065 2071 2076 2082 2088 2093 2099

Long years in the 22nd century:
2105 2111 2116 2122 2128 2133 2139 2144 2150 2156 2161 2167 2172 2178 2184 2189 2195
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