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<?php $currentDate = new DateTimeImmutable(); $firstOfTheMonth = new DateTimeImmutable($currentDate->format('Y-m-1')); $oneMonthInterval = new DateInterval('P1M'); var_dump($firstOfTheMonth->sub($oneMonthInterval));
Output for git.master, git.master_jit, rfc.property-hooks
object(DateTimeImmutable)#4 (3) { ["date"]=> string(26) "2017-02-01 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }

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