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  1. or download this
    if (check_date($year,$month,$day))
  2. or download this
    use strict;
use warnings;
...

printf "[$year, $month, $day] %s a valid date\n",
    check_date( $year, $month, $day ) ? 'is' : 'is not';
  3. or download this
    [2006, 1, 30] is a valid date
[2006, 1, 32] is not a valid date
[2006, 2, 29] is not a valid date