Unfortunately, this isn't thorough. Leap years don't occur if the year is a centennial year (although they do occur every 4th century). Here is what we in some of the NMS scripts:

sub is_leap {
  my $y = shift;
  return (!($y % 100) && !($y % 400)) || (($y % 100) && !($y % 4));
}

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In reply to Re: Checking for leap year by jryan
in thread Checking for leap year by joshua

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