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@ 2015-11-30T12:13:50Z

<?php
var_dump(new \DateInterval('P1M'));
$date = new \DateTime('2014-01-30');
var_dump($date->add(new \DateInterval('P1M')));

Output
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var_dump: documentation ( source)

preferences:dark modelive preview

56.27 ms | 402 KiB | 5 Q