- var_dump: documentation ( source)
<?php
$date = DateTime::createFromFormat("m-d-Y","05-25-2016");
var_dump($date->format("d-m-Y"));
var_dump($date->format("m-d-Y"));
var_dump($date->format("Y-m-d"));
var_dump($date->format("Y-d-m"));
var_dump($date);