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<?php $res = DateTimeImmutable::createFromFormat("Y-m-d", "2015-09-34"); var_dump($res);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
object(DateTimeImmutable)#1 (3) { ["date"]=> string(26) "2015-10-04 08:51:45.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }

preferences:
77.34 ms | 1268 KiB | 4 Q