Template:IsLeapYear
0
- Usage:
- {{IsLeapYear|year}}
- year defaults to {{
CURRENTYEAR}} = 2025
.
- 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}} = 1
are unspecified, even if it apparently gives an "expected" result at the moment this might change without notice.
