I do not understand this change. The checkDate() method is not related to the pattern being applied to the input string.

Also checkDate is marked as @internal so should not be overwritten anyway. 👎

@xabbuh
yyyy-mm-dd (original)
const PATTERN = '/^(\d{4})-(\d{2})-(\d{2})$/';
public static function checkDate($year, $month, $day)

dd.mm.yyyy (my)
const PATTERN = '/^(\d{2}).(\d{2}).(\d{4})$/';
public static function checkDate($day, $month, $year)

Different pattern - different order in income params of checkDate function. Original DateValidator always calls own checkDate, not extended. Changing self to $this will salve this problem.

@Tobion
I want to extend Constraints\Date and Constraints\DateValidator to use in my validation. Don't want to add additional date format changing to whole project. Why i cant extend checkDate()?

Imo the right approach for your use case would be to introduce a format option like it was proposed for the DateTime constraint in #17553.

@xabbuh so, datetime validator with format option will solve my problem :)

Ok, let's close this one then.