--TEST-- DateTime::createFromFormat() does not allow NULL $timezone --FILE-- <?php date_default_timezone_set('America/Los_Angeles'); var_dump(DateTime::createFromFormat('Y/m/d H:i:s', '1995/06/08 12:34:56', null)); var_dump(DateTimeImmutable::createFromFormat('Y/m/d H:i:s', '1995/06/08 12:34:56', null)); --EXPECT-- object(DateTime)#1 (3) { ["date"]=> string(26) "1995-06-08 12:34:56.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(19) "America/Los_Angeles" } object(DateTimeImmutable)#1 (3) { ["date"]=> string(26) "1995-06-08 12:34:56.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(19) "America/Los_Angeles" }