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run code in 200+ php & hhvm versions
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<?php var_dump(date('r', strtotime('2014-02-28 saturday')));
Output for 5.1.0 - 7.2.0
string(31) "Sat, 01 Mar 2014 00:00:00 +0100"
Output for 4.3.0 - 5.0.5
string(31) "Fri, 28 Feb 2014 00:00:00 +0100"