- var_dump: documentation ( source)
<?php
$x = (new DateTimeImmutable('today'))->setTimeZone(new DateTimeZone('UTC'));
$y = (new DateTimeImmutable('today'))->setTimeZone(new DateTimeZone('Europe/Rome'));
var_dump($x->setTime(10, 10, 10) == $y->setTime(12, 10, 10));