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@ 2013-09-17T17:30:47Z

<?php

$a = new DateTime;
$b = new DateTime;
$b->sub(new DateInterval('P1M'));

var_dump($a->diff($b), $b->diff($a));

Output
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var_dump: documentation ( source)

preferences:dark modelive preview

34.25 ms | 402 KiB | 5 Q