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run code in 200+ php & hhvm versions
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<?php echo (new DateTime())->modify('-25 years')->format('U');
Output for 5.6.30, hhvm-3.15.4, hhvm-3.18.5, hhvm-3.20.2 - 3.22.0, 7.0.0 - 7.2.9
710773830
Output for hhvm-3.18.4, hhvm-3.19.2
710773831