Hi yenni,

You just need to add a regularexpression attribute in your model, you can do it like this:

[ExpiryDate]
[RegularExpression(@"^(19|20)dd([- /.])(0[1-9]|1[012])2(0[1-9]|[12][0-9]|3[01])$”)]
public DateTime ExpiryDate { get; set; }

You can change the expression to what you want.

Hope this helpful

Regards

Young Yang