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@ 2016-09-13T14:27:03Z

<?php

$years = 5;

$baseDate = new \DateTime();
$baseDate = new \DateTime($baseDate->format('Y-m-01 00:00:00'));
$baseDate->modify('-' . $years . ' years');

var_dump($baseDate);

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

24.44 ms | 404 KiB | 5 Q