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<?php $firstOfTheMonth = new DateTimeImmutable('first day of this month'); var_dump($firstOfTheMonth->modify("-1 month"));
Output for git.master
object(DateTimeImmutable)#2 (3) { ["date"]=> string(26) "2017-02-01 18:48:10.004172" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for git.master_jit
object(DateTimeImmutable)#2 (3) { ["date"]=> string(26) "2017-02-01 18:48:10.003778" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for rfc.property-hooks
object(DateTimeImmutable)#2 (3) { ["date"]=> string(26) "2017-02-01 18:48:10.003519" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }

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