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run code in 200+ php & hhvm versions
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<?php date_default_timezone_set('UTC'); print_r(date('Y-m-d H:i:s',strtotime('6/21/2016 2:33:55 PM')));
based on ZhuIg
Output for 5.6.0 - 7.3.0beta1
2016-06-21 14:33:55