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<?php $test = strtotime('2014-02-11 24:00:00'); var_dump($test); var_dump(date('Y-m-d H:i:s'), $test);
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.37, 5.6.0 - 5.6.28, 7.0.0 - 7.0.14, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
int(1392159600) string(19) "2014-02-11 09:41:27" int(1392159600)
Output for 7.3.32 - 7.3.33, 7.4.26, 8.0.13
int(1392163200) string(19) "2014-02-11 08:41:27" int(1392163200)
Output for 7.0.20
int(1392159600) string(19) "2014-02-11 09:41:28" int(1392159600)
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
bool(false) string(19) "2014-02-11 09:41:27" bool(false)
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5
int(-1) string(19) "2014-02-11 09:41:27" int(-1)

preferences:
284.15 ms | 402 KiB | 394 Q