Day of the week of Christmas and New Year: Difference between revisions
Day of the week of Christmas and New Year (view source)
Revision as of 05:04, 17 December 2022
, 1 year agoAdded EasyLang implementation
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<pre>12/25/2021 is a Saturday
1/1/2022 is a Saturday</pre>
=={{header|EasyLang}}==
<syntaxhighlight lang="easylang">
func dayOfTheWeek year month day . result .
# Based on Conway's doomsday algorithm
# 1. Calculate the doomsday for the century
century = floor (year / 100)
if century mod 4 = 0
centuryDoomsday = 2
elif century mod 4 = 1
centuryDoomsday = 0
elif century mod 4 = 2
centuryDoomsday = 5
elif century mod 4 = 3
centuryDoomsday = 3
.
# 2. Find the doomsday of the year
mainYear = year mod 100
yearDoomsday = (floor (mainYear / 12) + mainYear mod 12 + floor (mainYear mod 12 / 4) + centuryDoomsday) mod 7
# 3. Check if the year is leap
if mainYear = 0
if century mod 4 = 0
leap = 1
else
leap = 0
.
else
if mainYear mod 4 = 0
leap = 1
else
leap = 0
.
.
# 4. Calculate the DOTW of January 1
if leap = 1
januaryOne = (yearDoomsday + 4) mod 7
else
januaryOne = (yearDoomsday + 5) mod 7
.
# 5. Determine the nth day of the year
if month = 1
NthDay = 0
elif month = 2
NthDay = 31
elif month = 3
NthDay = 59 + leap
elif month = 4
NthDay = 90 + leap
elif month = 5
NthDay = 120 + leap
elif month = 6
NthDay = 151 + leap
elif month = 7
NthDay = 181 + leap
elif month = 8
NthDay = 212 + leap
elif month = 9
NthDay = 243 + leap
elif month = 10
NthDay = 273 + leap
elif month = 11
NthDay = 304 + leap
elif month = 12
NthDay = 334 + leap
.
NthDay += day
# 6. Finally, calculate the day of the week
result = (januaryOne + NthDay - 1) mod 7
.
func numberToDay n . day$ .
if n = 0
day$ = "Sunday"
elif n = 1
day$ = "Monday"
elif n = 2
day$ = "Tuesday"
elif n = 3
day$ = "Wednesday"
elif n = 4
day$ = "Thursday"
elif n = 5
day$ = "Friday"
elif n = 6
day$ = "Saturday"
.
.
call dayOfTheWeek 2021 12 25 result
call numberToDay result day$
print "2021-12-25 is on " & day$
call dayOfTheWeek 2022 1 1 result
call numberToDay result day$
print "2022-1-1 is on " & day$
</syntaxhighlight>
{{out}}
<pre>
2021-12-25 is on Saturday
2022-1-1 is on Saturday
</pre>
=={{header|F_Sharp|F#}}==
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