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fixes #13543 and added times.isLeapDay (#13547)

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Timothee Cour 2020-03-01 12:56:20 -08:00 • committed by GitHub
commit 22d1ba4be7
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3 changed files with 21 additions and 3 deletions
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13
lib/pure/times.nim
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@ -637,6 +637,19 @@ proc isLeapYear*(year: int): bool =
doAssert not isLeapYear(1900)
year mod 4 == 0 and (year mod 100 != 0 or year mod 400 == 0)
proc isLeapDay*(t: DateTime): bool {.since: (1,1).} =
## returns whether `t` is a leap day, ie, Feb 29 in a leap year. This matters
## as it affects time offset calculations.
runnableExamples:
let t = initDateTime(29, mFeb, 2020, 00, 00, 00, utc())
doAssert t.isLeapDay
doAssert t+1.years-1.years != t
let t2 = initDateTime(28, mFeb, 2020, 00, 00, 00, utc())
doAssert not t2.isLeapDay
doAssert t2+1.years-1.years == t2
doAssertRaises(Exception): discard initDateTime(29, mFeb, 2021, 00, 00, 00, utc())
t.year.isLeapYear and t.month == mFeb and t.monthday == 29
proc getDaysInMonth*(month: Month, year: int): int =
## Get the number of days in ``month`` of ``year``.
# http://www.dispersiondesign.com/articles/time/number_of_days_in_a_month