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<?php $dt = new \DateTime('2018-02-13'); $dt->modify('first day of this month'); var_dump($dt);
Output for 7.3.0alpha1
object(DateTime)#1 (3) { ["date"]=> string(26) "2018-02-01 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }