- var_dump: documentation ( source)
<?php
$date = new DateTimeImmutable('now', new DateTimeZone('Pacific/Midway'));
$date2 = new DateTimeImmutable('now', new DateTimeZone('US/Samoa'));
echo $date->format(DateTimeInterface::ATOM) . PHP_EOL;
echo $date2->format(DateTimeInterface::ATOM) . PHP_EOL;
var_dump($date == $date2);