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<?php const ISO8601U = "Y-m-d\TH:i:s.uO"; var_dump(DateTime::createFromFormat(ISO8601U, '2015-08-31T00:55:00.000Z'));
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
object(DateTime)#1 (3) { ["date"]=> string(26) "2015-08-31 00:55:00.000000" ["timezone_type"]=> int(2) ["timezone"]=> string(1) "Z" }

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126.23 ms | 408 KiB | 5 Q