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<?php $interval = new DateInterval('PT1S'); $interval->f = 500000; var_dump(date_create_immutable('2017-03-15')->add($interval));
Output for git.master, git.master_jit, rfc.property-hooks
object(DateTimeImmutable)#3 (3) { ["date"]=> string(26) "2017-03-20 18:53:21.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }

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