force date entry with dashes

Happy new year for all.

In a custom field, wich is a date, i would like to know the syntax to force validation according to the format with dashes.
For example : 14-01-2023
Could you give me the validation rule to write ?
Thank you a lot.
Best regards

Hello

Exactly how you want to validate data for that field? Could you please explain more details about it?

Tuan

Hello TuanTo register for an event, I ask for the athlete's date of birth.
The field is a Date type field. And when typing, I would like the date format to be as follows: 15-01-1961
So I would like to know how to write the validation rule so that the date entered is in this format with dashes.
Thank you so much.