- var_dump: documentation ( source)
<?php
var_dump((new \DateTime())->format(\DateTime::ISO8601));
$dem = (new \DateTime('2017-03-06T12:10:00+0100'));
$created = (new \DateTime('2017-03-06T12:05:00+0100'));
//var_dump($dem->format('d.m.Y H:i:s'));
//var_dump($created->format('d.m.Y H:i:s'));
//var_dump($dem->getTimezone());
//var_dump($created->getTimezone());
var_dump($dem > $created);