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<?php var_dump(unserialize(serialize(new DateTime('2014-12-01 01:23:45 +01:00'))));
Output for 5.4.30 - 5.4.45, 5.5.14 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
object(DateTime)#1 (3) { ["date"]=> string(26) "2014-12-01 01:23:45.000000" ["timezone_type"]=> int(1) ["timezone"]=> string(6) "+01:00" }
Output for 5.4.0 - 5.4.29, 5.5.0 - 5.5.13
object(DateTime)#1 (3) { ["date"]=> string(19) "2014-12-01 01:23:45" ["timezone_type"]=> int(1) ["timezone"]=> string(6) "+01:00" }

preferences:
325.93 ms | 402 KiB | 375 Q