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<?php $d = new \DateTime('2013-07-31'); echo $d->format('Y-m-d H:i:s'), "\n"; $s = clone $d; $d->modify('first day of last month'); echo $d->format('Y-m-d H:i:s');
Output for git.master, git.master_jit, rfc.property-hooks
2013-07-31 00:00:00 2013-06-01 00:00:00

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