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<?php $dt = new DateTime(); $test = clone $dt; $test->modify('first day'); var_dump($test->format('r')); $test = clone $dt; $test->modify('first day of'); var_dump($test->format('r'));
Output for git.master, git.master_jit, rfc.property-hooks
string(31) "Wed, 06 Aug 2014 13:04:05 +0200" string(31) "Fri, 01 Aug 2014 13:04:05 +0200"

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