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<?php var_dump(false === ($date = strtotime('02-01-1970'))); var_dump(date('Y-m-d',$date));
Output for 5.1.3 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
bool(false) string(10) "1970-01-02"
Output for 5.1.0 - 5.1.2
bool(true) string(10) "1970-01-01"
Output for 4.3.0 - 5.0.5
bool(false) string(10) "2007-05-24"