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@ 2015-07-07T20:33:09Z

<?php

$d = new DateTime('2011-01-15 00:00:00');

$d2 = $d->modify('first day of this month');
echo Date('t', 2);

//$d2 = $d2->modify('last day of this month');
//$d3 = $d2->modify('last day of previous month');

var_dump($d2);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
date: documentation ( source)

preferences:dark modelive preview

44.82 ms | 402 KiB | 5 Q