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<?php $a = new \DateTime(); $from = clone $a; $from->modify('first day of this month 00:00:00'); var_dump($from);
Output for 5.4.30 - 5.4.45, 5.5.14 - 5.6.38, hhvm-3.10.1 - 3.22.0, 7.0.0 - 7.3.0
object(DateTime)#2 (3) { ["date"]=> string(26) "2015-12-01 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.3.21 - 5.4.29, 5.5.0 - 5.5.13
object(DateTime)#2 (3) { ["date"]=> string(19) "2015-12-01 00:00:00" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }