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run code in 200+ php & hhvm versions
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<?php $date = new DateTime('now'); var_dump($date->format('c'));
Output for 5.5.0 - 5.6.30, hhvm-3.10.1 - 3.17.3, 7.0.0 - 7.2.0
string(25) "2015-12-31T14:40:34+01:00"