- var_dump: documentation ( source)
<?php
$date = new DateTime('2005-10-10', new DateTimeZone('America/Los_Angeles'));
var_dump($date->format('c e T'));
$date->setTimezone(new DateTimeZone('CET'));
var_dump($date->format('c e T'));
$date = new DateTime('2005-10-10', new DateTimeZone('PST'));
var_dump($date->format('c e T'));
$date->setTimezone(new DateTimeZone('CET'));
var_dump($date->format('c e T'));