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@ 2015-03-20T14:55:00Z

<?php

$now = new DateTimeImmutable("2015-03-31");

var_dump($now->format("Y-m-d"));
var_dump($now->modify("-1 month")->format("Y-m-d"));

Output
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var_dump: documentation ( source)

preferences:dark modelive preview

43.64 ms | 402 KiB | 5 Q