عرض مصدر قالب:IsLeapYear/شرح

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; Usage:
: {{Tlx|IsLeapYear|''year''}}
: ''year'' defaults to {{evaldemo|CURRENTYEAR|=}}. It must be specified in the Gregorian calendar, extended to all epochs using linear year numbering: use the [[proleptic Gregorian calendar]] in Christian Era before the change, and the astronomical year convention (using negative numbers, and year 0) in all years BC before the Christian era (there's a difference of 1 in absolute value).
: This template is substitutable.
; Formula:
: Is equivalent to <nowiki>{{#expr: ((({{{1}}}) mod 4 = 0) and (({{{1}}}) mod 100 != 0)) or (({{{1}}}) mod 400 = 0)}}</nowiki>, but for efficiency is currently coded as <nowiki>{{#time:L | 1 January {{{1}}} }}</nowiki>
; Sanity check:
: {{evaldemo/3|IsLeapYear|2000}}: 2000 AD is ''effectively'' a leap year ''(in both the Julian and Gregorian calendars)''.
: {{evaldemo/3|IsLeapYear|502*4-8}}: 2000 AD is ''effectively'' a leap year ''(in both the Julian and Gregorian calendars)''.
: {{evaldemo/3|IsLeapYear|2001}}: 2001 AD is not a leap year.
: {{evaldemo/3|IsLeapYear|2004}}: 2004 AD is a leap year.
: {{evaldemo/3|IsLeapYear|2005}}: 2005 AD is not a leap year.
: {{evaldemo/3|IsLeapYear|2007}}: 2007 AD is not a leap year.
: {{evaldemo/3|IsLeapYear|2008}}: 2008 AD is a leap year.
: {{evaldemo/3|IsLeapYear|2009}}: 2009 AD is not a leap year.
: {{evaldemo/3|IsLeapYear|2100}}: 2100 AD is not a leap year in the Gregorian calendar ''(but not in the Julian calendar)''.
: {{evaldemo/3|IsLeapYear|2400}}: 2400 AD is ''effectively'' a leap year ''(in both the Julian and Gregorian calendars)''.
: {{evaldemo/3|IsLeapYear|1900}}: 1900 AD is not a leap year in the Gregorian calendar ''(but not in the Julian calendar)''.
: {{evaldemo/3|IsLeapYear|1800}}: 1800 AD is not a leap year in the Gregorian calendar ''(but not in the Julian calendar)''.
: {{evaldemo/3|IsLeapYear|1700}}: 1700 AD is not a leap year in the Gregorian calendar ''(but not in the Julian calendar)''.
: {{evaldemo/3|IsLeapYear|1600}}: 1600 AD is ''effectively'' a leap year ''(in both the Julian and Gregorian calendars)''.
: {{evaldemo/3|IsLeapYear|1500}}: 1500 AD is not a leap year in the [[proleptic Gregorian calendar]] ''(but is leap in the actual Julian calendar)''.
: {{evaldemo/3|IsLeapYear|0}}: 1 BC is a leap year in the astronomical calendar ''(mostly pointless for actual calendars of such epoch, but correct in the astronomical calendar where it is year 0)''.
: {{evaldemo/3|IsLeapYear|-100}}: 101 BC is not a leap year in the astronomical calendar ''(mostly pointless for actual calendars of such epoch, but correct in the astronomical calendar where it is year -100)''.

Results for fractions like {{evaldemo/3|IsLeapYear|2000.9|5==}} are unspecified, even if it apparently gives an "expected" result at the moment this might change without notice.

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