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