- var_dump: documentation ( source)
<?php
$dt1 = new DateTime('now', new DateTimeZone('Australia/Perth'));
$dt2 = new DateTime('now', new DateTimeZone('Australia/Sydney'));
$dt1->setTimezone(new DateTimeZone('UTC'));
$dt2->setTimezone(new DateTimeZone('UTC'));
var_dump($dt1);
var_dump($dt2);