- var_dump: documentation ( source)
- date: documentation ( source)
- strtotime: documentation ( source)
<?php
$incorrect = '1999-11-30';
$time = date('Y-m-d',strtotime('00-00-00 00:00:00'));
var_dump($time === $incorrect);
var_dump($strtotime($incorrent));
var_dump($strtotime('00-00-00'));