Template:IsLeapYear/doc
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- Usage:
- {{IsLeapYear|year}}
- year defaults to {{
CURRENTYEAR}} = 2007. - Formula:
- {{#expr: ((({{{1}}}) mod 4 = 0) and (({{{1}}}) mod 100 != 0)) or (({{{1}}}) mod 400 = 0)}}
- Use {{subst:IsLeapYear}} to get this code ready for optional substitution into another template.
- Sanity check:
- {{ IsLeapYear | 2000 }} gives 1
- {{ IsLeapYear | 2007 }} gives 0, 2007 is not a leap year.
- {{ IsLeapYear | 2008 }} gives 1, 2008 is a leap year.
- {{ IsLeapYear | 2100 }} gives 0, 2100 is not a leap year.
- {{ IsLeapYear | 2400 }} gives 1, 2400 is a leap year.
- {{ IsLeapYear | 1500 }} gives 0, proleptic Gregorian calendar.
- {{ IsLeapYear | -100 }} gives 0 for 101 BC (mostly pointless).
- {{ IsLeapYear | 502*4-8 }} gives 1, guess why.
Results for fractions like {{ IsLeapYear | 2000.9 }} = 1 are unspecified, even if it apparently gives an "expected" result at the moment this might change without notice.
