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<?php var_dump(DateTime::createFromFormat('c', '2015-08-31T00:55:00Z')); var_dump(DateTime::createFromFormat(DateTime::ISO8601, '2015-08-31T00:55:00Z')); var_dump(DateTime::createFromFormat(DateTime::ISO8601, '2015-08-31T00:55:00.000Z'));
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 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) "2015-08-31 00:55:00.000000" ["timezone_type"]=> int(2) ["timezone"]=> string(1) "Z" } bool(false)

preferences:
172.52 ms | 405 KiB | 218 Q