- var_dump: documentation ( source)
<?php
$utc = new DateTimeZone('UTC');
$brw = new DateTimeZone('Brazil/West');
$dt = new DateTime('2016-02-05T00:00:00-04:00');
$dt2 = new DateTime('2016-02-05T00:00:00-04:00', $utc);
$dt3 = new DateTime('2016-02-05T00:00:00', $brw);
var_dump($dt->format('Y-m-d H:i:s'));
var_dump($dt2);
var_dump($dt3);