- var_dump: documentation ( source)
- date_default_timezone_set: documentation ( source)
- strtotime: documentation ( source)
- date_parse: documentation ( source)
<?php
date_default_timezone_set("UTC");
var_dump( date_parse('0000-00-00 00:00:00') );
var_dump( strtotime('0000-00-00 00:00:00') );
var_dump( $dt = new DateTime('0000-00-00 00:00:00') );
echo $dt->format( DateTime::ISO8601 ), "\n";