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run code in 150+ php & hhvm versions
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<?php $timestamp = strtotime("2014-01-31"); echo date('Y/m/d', strtotime('last day of month after '.date('F', $timestamp).' '.date('Y', $timestamp)));
based on EY3Aq
Output for 4.3.0 - 7.1.0
1970/01/01