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run code in 200+ php & hhvm versions
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<?php $time = mktime(0,0,0,0,0,2014); var_dump($time, date('Y-m-d H:i:s', $time));
Output for 4.3.0 - 7.2.0
int(1385766000) string(19) "2013-11-30 00:00:00"