Given a year (or date), it returns true if it is a Gregorian leap year, or false if it is not. If no year is passed, it assumes the current year.
Parameters
-year
integer, optional
Year to check if it's a leap year. May also pass in a [date] instead.
Sample Usage
<pre>
<b>LeapYear Example</b>
[loop: -from=1800, -to=2200][if: (lp_date_leapyear: loop_count)]
[loop_count] is a leap year[/if][/loop]
</pre>
[lp_date_leapyear]
[lp_date_leapyear: date]
Source Code
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[
define_tag:'lp_date_leapyear',
-description='Given a year (or date), it returns true if it is a Gregorian leap year, or false if it is not. If no year is passed, it assumes the current year.',
-priority='replace',
-optional='year',-copy;
// gregorian leap year algorithm from http://mindprod.com/jglossleapyear.html (now MIA)
// valid roughly from 1800 forward
if: !(local_defined:'year');
local:'year' = date;
/if;
if: #year->type == 'date';
#year = (integer: #year->year);
else; // assume integer year
#year = integer: #year;
/if;
if: #year % 4 != 0;
return: false;
else: #year % 100 != 0;
return: true;
else: #year % 400 != 0;
return: false;
else;
return: true;
/if;
/define_tag;
]
