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<?php $d = new \DateTimeImmutable('2000-01-01 23:59:59.999999'); $d2 = $d->modify('+1 microsecond'); var_dump($d); var_dump($d->format('s.u')); var_dump($d2); var_dump($d2->format('s.u'));
Output for git.master, git.master_jit, rfc.property-hooks
object(DateTimeImmutable)#1 (3) { ["date"]=> string(26) "2000-01-01 23:59:59.999999" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } string(9) "59.999999" object(DateTimeImmutable)#2 (3) { ["date"]=> string(26) "2000-01-02 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } string(9) "00.000000"

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