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@ 2015-08-04T02:12:33Z

<?php

$a_date = "2009-11-23";
echo date("Y-m-t", strtotime($a_date));

echo (new DateTime('2010-01-19'))
      ->modify('first day of this month')
      ->format('jS, F Y');

Output
Performance
VLD
References
Branches

date: documentation ( source)
strtotime: documentation ( source)

preferences:dark modelive preview

80.1 ms | 402 KiB | 5 Q