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<?php var_dump(date("Y-m-d", strtotime("2014.01.01"))); var_dump(date("Y-m-d", strtotime("2014-01-01")));
Output for 4.3.0 - 5.0.5, 5.1.3 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(10) "1970-01-01" string(10) "2014-01-01"
Output for 5.1.0 - 5.1.2
string(10) "2014-03-12" string(10) "2014-01-01"