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<?php var_dump(unserialize(serialize(new DateTime("2013-02-02T00:00:00Z")))); var_dump(unserialize(serialize(new DateTime("2013-02-02T00:00:00Y"))));
Output for 5.4.30 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 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) "2013-02-02 00:00:00.000000" ["timezone_type"]=> int(2) ["timezone"]=> string(1) "Z" } object(DateTime)#1 (3) { ["date"]=> string(26) "2013-02-02 00:00:00.000000" ["timezone_type"]=> int(2) ["timezone"]=> string(1) "Y" }
Output for 5.4.0 - 5.4.29
object(DateTime)#1 (3) { ["date"]=> string(19) "2013-02-02 00:00:00" ["timezone_type"]=> int(2) ["timezone"]=> string(1) "Z" } object(DateTime)#1 (3) { ["date"]=> string(19) "2013-02-02 00:00:00" ["timezone_type"]=> int(2) ["timezone"]=> string(1) "Y" }

preferences:
193.36 ms | 402 KiB | 228 Q