- var_dump: documentation ( source)
<?php
$baseDate = new DateTime('2017-01-01', new DateTimezone('UTC'));
$endDate = clone $baseDate;
for($i = 1; $i <= 5; ++$i) {
$duration = new DateInterval("PT{$i}H");
$baseDate->add($duration);
var_dump($baseDate);
var_dump($endDate);
}