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run code in 200+ php & hhvm versions
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<?php echo (new DateTime('2017-04-21T09:59:18-04:00'))->format('Y-m-d');
based on nlefA
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc6
2017-04-21