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@ 2015-04-27T05:21:01Z

<?php
$datetime = new DateTime('2015-03-31');
var_dump($datetime);

var_dump(new DateInterval('P1M'));

$datetime->sub(new DateInterval('P1M'));
var_dump($datetime);

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

37.69 ms | 402 KiB | 5 Q