The Date::Leapyear module will tell if a year is a (Gregorian) leap year: 
  use Date::Leapyear;
  if ( isleap(yyyy) ) {
    ...
  }

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The function isleap(yyyy) returns 1 in a leap year, 0 otherwise.

In reply to Re: Leap Year by Agyeya
in thread How do I determine if a given year is a leap year? by Adam

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