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<?php $t = new DateTime('2018-02-31'); var_dump($t);
Output for 7.0.31 - 7.3.0rc3
object(DateTime)#1 (3) { ["date"]=> string(26) "2018-03-03 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }