- var_dump: documentation ( source)
<?php
$first = (new DateTime('2018-07-01 04:00:00.000000 America/Toronto'));
$second = new DateTime('2018-07-02 00:00:00.000000 America/Toronto');
$third = (new DateTime('2018-07-01 00:00:00.000000 America/Toronto'))
->setTimezone(new DateTimeZone('UTC'));
var_dump(
$first->diff($second),
$third->diff($second)
);