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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 7.2.29 - 7.2.33, 7.3.16 - 7.3.28, 7.4.0 - 7.4.16, 8.0.0 - 8.0.3
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"
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.6
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(27) "2000-01-01 23:59:59.1000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } string(10) "59.1000000"