- var_dump: documentation ( source)
- date_default_timezone_set: documentation ( source)
<?php
date_default_timezone_set('Europe/Minsk');
$a = new DateTimeImmutable("2015-01-01 11:00:00");
$b = $a->setTime(10, 0)->setTimezone(new DateTimeZone("03:00"));
var_dump($a > $b);
$a->getTimestamp();
$b->getTimestamp();
var_dump($a > $b);