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<?php var_dump( date('U', strtotime('2017-07-12 12:54:00')), date('U', strtotime('2017-07-12T12:54:00')), date('U', strtotime('12/07/2017 12:54:00')), date('U', strtotime('12/07/2017T12:54:00')) );
Output for 7.0.0 - 7.0.31, 7.1.0 - 7.1.21, 7.2.0 - 7.2.33, 7.3.16 - 7.3.31, 7.4.0 - 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 - 8.3.7
string(10) "1499856840" string(10) "1499856840" string(10) "1512647640" string(10) "1512647640"
Output for 7.3.32 - 7.3.33, 8.0.13
string(10) "1499864040" string(10) "1499864040" string(10) "1512651240" string(10) "1512651240"
preferences:
167.71 ms | 402 KiB | 205 Q