- var_dump: documentation ( source)
<?php
$date1 = new DateTime("@1351382400");
var_dump($date1->format('c')); // Sun Oct 28 2012 00:00:00+00:00
var_dump($date1->getTimestamp()); //prints: 1351382400
$date1->setTimezone(new DateTimeZone("Europe/Stockholm"));
var_dump($date1->format('U')); // prints: 1351382400
var_dump($date1->getTimestamp()); //prints: 1351386000