https://safernicotine.wiki/mediawiki/index.php?action=history&feed=atom&title=Template%3AIsLeapYear%2FdocTemplate:IsLeapYear/doc - Revision history2026-05-25T06:54:06ZRevision history for this page on the wikiMediaWiki 1.45.3https://safernicotine.wiki/mediawiki/index.php?title=Template:IsLeapYear/doc&diff=38403&oldid=previmported>Gonnym at 11:03, 29 January 20222022-01-29T11:03:32Z<p></p>
<p><b>New page</b></p><div>{{Documentation subpage}}<br />
<!-- EDIT TEMPLATE DOCUMENTATION BELOW THIS LINE --><br />
----<br />
=== Usage ===<br />
{{shortcut|template:ly}}<br />
: {{Tlx|IsLeapYear|''year''}}<br />
: ''year'' defaults to {{tld|CURRENTYEAR|}} ({{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).<br />
===Parameters===<br />
* ''Unnamed parameter'' The year to calculate with (default: {{CURRENTYEAR}})<br />
* {{para|yes}} What to output if it is a leap year (default : 1)<br />
* {{para|no}} What to output if it isn't a leap year (default: 0)<br />
=== Formula ===<br />
The template currently uses Wikimedia function time (#time). It is the same as if 4 mod year = 0 and 100 mod year ≠ 0, then not a leap year, unless 400 mod year = 0, then it is a leap year.<br />
<br />
=== Sanity check ===<br />
* {{tld|IsLeapYear|2000|_show_result=y}}: 2000 AD is ''effectively'' a leap year ''(in both the Julian and Gregorian calendars)''.<br />
* {{tld|IsLeapYear|502*4-8|_show_result=y}}: 2000 AD is ''effectively'' a leap year ''(in both the Julian and Gregorian calendars)''.<br />
* {{tld|IsLeapYear|2001|_show_result=y}}: 2001 AD is not a leap year.<br />
* {{tld|IsLeapYear|2004|_show_result=y}}: 2004 AD is a leap year.<br />
* {{tld|IsLeapYear|2005|_show_result=y}}: 2005 AD is not a leap year.<br />
* {{tld|IsLeapYear|2007|_show_result=y}}: 2007 AD is not a leap year.<br />
* {{tld|IsLeapYear|2008|_show_result=y}}: 2008 AD is a leap year.<br />
* {{tld|IsLeapYear|2009|_show_result=y}}: 2009 AD is not a leap year.<br />
* {{tld|IsLeapYear|2100|_show_result=y}}: 2100 AD is not a leap year in the Gregorian calendar ''(but not in the Julian calendar)''.<br />
* {{tld|IsLeapYear|2400|_show_result=y}}: 2400 AD is ''effectively'' a leap year ''(in both the Julian and Gregorian calendars)''.<br />
* {{tld|IsLeapYear|1900|_show_result=y}}: 1900 AD is not a leap year in the Gregorian calendar ''(but not in the Julian calendar)''.<br />
* {{tld|IsLeapYear|1800|_show_result=y}}: 1800 AD is not a leap year in the Gregorian calendar ''(but not in the Julian calendar)''.<br />
* {{tld|IsLeapYear|1700|_show_result=y}}: 1700 AD is not a leap year in the Gregorian calendar ''(but not in the Julian calendar)''.<br />
* {{tld|IsLeapYear|1600|_show_result=y}}: 1600 AD is ''effectively'' a leap year ''(in both the Julian and Gregorian calendars)''.<br />
* {{tld|IsLeapYear|1500|_show_result=y}}: 1500 AD is not a leap year in the [[proleptic Gregorian calendar]] ''(but is leap in the actual Julian calendar)''.<br />
* {{tld|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)''.<br />
* {{tld|IsLeapYear|-100|_show_result=y}}: 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)''.<br />
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Results for fractions like {{tld|IsLeapYear|2000.9|_show_result=y}} are rounded down (floor).<br />
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<includeonly>{{Sandbox other||<br />
<!-- ADD CATEGORIES BELOW THIS LINE --><br />
[[Category:Date mathematics templates|{{PAGENAME}}]]<br />
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[[ja:Template:Is-leap-year]]<br />
[[ur:سانچہ:IsLeapYear]]<br />
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}}</includeonly></div>imported>Gonnym