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<?php $v = DateTimeImmutable::createFromFormat('!m-d', '99-99'); var_dump($v); var_dump(DateTimeImmutable::getLastErrors());
Output for 8.1.0 - 8.1.29, 8.2.0 - 8.2.23, 8.3.0 - 8.3.11
object(DateTimeImmutable)#1 (3) { ["date"]=> string(26) "1978-06-07 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } array(4) { ["warning_count"]=> int(1) ["warnings"]=> array(1) { [5]=> string(27) "The parsed date was invalid" } ["error_count"]=> int(0) ["errors"]=> array(0) { } }

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