Day of the week of Christmas and New Year

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Revision as of 15:45, 24 November 2021 by PureFox (talk | contribs) (→‎{{header|Wren}}: Revised in line with Raku example.)
Day of the week of Christmas and New 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.
Task


Determine programatically and show on this page on what weekday Christmas Day, 2021 and New Year's Day, 2022 will fall or did fall.

Python

<lang python> iimport datetime

weekDays = ("Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday") thisXMas = datetime.date(2021,12,25) thisXMasDay = thisXMas.weekday() thisXMasDayAsString = weekDays[thisXMasDay] print("This year's Christmas is on a {}".format(thisXMasDayAsString))

nextNewYear = datetime.date(2022,1,1) nextNewYearDay = nextNewYear.weekday() nextNewYearDayAsString = weekDays[nextNewYearDay+1] print("Next new year is on a {}".format(nextNewYearDayAsString)) </lang>

Output:
This year's Christmas is on a Saturday
Next new year is on a Sunday

Raku

<lang perl6>my @d-o-w = < Sunday Monday Tuesday Wednesday Thursday Friday Saturday >;

.say for (flat 2020..2022, (1500 .. 2500).roll(7)).sort.map: { 

    "In {$_}, New Years is on a { @d-o-w[Date.new($_,  1,  1).day-of-week % 7] }, " ~
    "and Christmas on a { @d-o-w[Date.new($_, 12, 25).day-of-week % 7] }."

}</lang>

Sample output:
In 1578, New Years is on a Sunday, and Christmas on a Monday.
In 1590, New Years is on a Monday, and Christmas on a Tuesday.
In 1642, New Years is on a Wednesday, and Christmas on a Thursday.
In 1957, New Years is on a Tuesday, and Christmas on a Wednesday.
In 2020, New Years is on a Wednesday, and Christmas on a Friday.
In 2021, New Years is on a Friday, and Christmas on a Saturday.
In 2022, New Years is on a Saturday, and Christmas on a Sunday.
In 2242, New Years is on a Saturday, and Christmas on a Sunday.
In 2245, New Years is on a Wednesday, and Christmas on a Thursday.
In 2393, New Years is on a Friday, and Christmas on a Saturday.

Wren

Library: Wren-date

This uses the same years as the Raku example.

The actual days for 1578 may have been different as the Gregorian calendar didn't start until 1582. <lang ecmascript>import "./date" for Date

var years = [1578, 1590, 1642, 1957, 2020, 2021, 2022, 2242, 2245, 2393] for (year in years) { 

   var newYear = Date.new(year, 1, 1).weekDay
   var xmas = Date.new(year, 12, 25).weekDay
   System.print("In %(year), New year's day is on a %(newYear), and Christmas day on %(xmas).")

}</lang>

Output:
In 1578, New year's day is on a Sunday, and Christmas day on Monday.
In 1590, New year's day is on a Monday, and Christmas day on Tuesday.
In 1642, New year's day is on a Wednesday, and Christmas day on Thursday.
In 1957, New year's day is on a Tuesday, and Christmas day on Wednesday.
In 2020, New year's day is on a Wednesday, and Christmas day on Friday.
In 2021, New year's day is on a Friday, and Christmas day on Saturday.
In 2022, New year's day is on a Saturday, and Christmas day on Sunday.
In 2242, New year's day is on a Saturday, and Christmas day on Sunday.
In 2245, New year's day is on a Wednesday, and Christmas day on Thursday.
In 2393, New year's day is on a Friday, and Christmas day on Saturday.
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