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<?php var_dump( \DateTime::createFromFormat('F d Y H:i', 'September 27, 2017 18:00'), \DateTime::createFromFormat('F d, Y H:i', 'September 27, 2017 18:00') );
Output for 7.0.0 - 7.0.24, 7.1.0 - 7.1.33, 7.2.6 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.29, 8.2.0 - 8.2.21, 8.3.0 - 8.3.9
bool(false) object(DateTime)#1 (3) { ["date"]=> string(26) "2017-09-27 18:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 7.3.32 - 7.3.33, 8.0.13
bool(false) object(DateTime)#1 (3) { ["date"]=> string(26) "2017-09-27 18:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" }

preferences:
196.18 ms | 402 KiB | 216 Q