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Diffstat (limited to 'lib/pure/times.nim')
| -rw-r--r-- | lib/pure/times.nim | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/lib/pure/times.nim b/lib/pure/times.nim index 3fc4d69df..92b6cd3b7 100644 --- a/lib/pure/times.nim +++ b/lib/pure/times.nim @@ -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 |