- var_dump: documentation ( source)
<?php
$date = \DateTime::createFromFormat('d.m.Y H:i:s', '01.01.1900 01:00:00', new \DateTimeZone('Europe/Berlin'));
var_dump($date);
$date->setTimezone(new DateTimeZone('UTC'));
var_dump($date);
$date->setTimezone(new DateTimeZone('Europe/Berlin'));
var_dump($date);