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run code in 200+ php & hhvm versions
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<?php var_dump(date('d.m.Y',strtotime('last day of January')));
based on nQlWJ
Output for 5.3.0 - 7.2.0
string(10) "31.01.2015"
Output for 4.3.0 - 5.2.17
string(10) "01.01.1970"