#!/usr/bin/perl

use strict;
use warnings;

use Time::Local;

while (<DATA>) {
  chomp;
  my ($y, $m, $d) = split /-/;

  eval { timelocal 0, 0, 0, $d, $m-1, $y-1900 };

  if ($@) {
    print "$_ is not a valid date\n";
  } else {
    print "$_ is a valid date\n";
  }
}

__DATA__
2006-10-30
2006-10-32
2006-02-29
2004-02-29