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run code in 200+ php & hhvm versions
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<?php var_dump(date('c'), gmdate('c'));
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
string(25) "2017-07-03T13:44:23+02:00" string(25) "2017-07-03T11:44:23+00:00"