Template:IsLeapYear

1

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Usage:

{{IsLeapYear|year}}

year defaults to "{{CURRENTYEAR|=}}" gives "Template:CURRENTYEAR" [1].

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|2007}} gives 0, 2007 is no leap year.

{{IsLeapYear|2008}} gives 1, 2008 is a leap year.

{{IsLeapYear|2100}} gives 0, 2100 is no 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|||=}} gives 1 are unspecified, even if it apparently gives an "expected" result at the moment this might change without notice.