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run code in 200+ php & hhvm versions
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<?php $date = strtotime('- 48 hours'); var_dump(date('Y-m-d:H')); var_dump(date('Y-m-d:H', $date));
based on vB3if
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0beta1
string(13) "2017-02-07:18" string(13) "2017-02-05:18"