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run code in 200+ php & hhvm versions
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<?php var_dump( date("Y-m-d", strtotime('140509')) ); ?>
Output for 5.1.0 - 7.2.0
string(10) "2014-06-06"
Output for 4.3.0 - 5.0.5
string(10) "2014-05-09"