Client Validation Date of Birth - using FluentValidation (NOP chosen validation methodology)

I'm on the REGISTER page and need to display the Date of Birth set of combos.
I also need to ensure that a Date is chosen so i added my own FluentValidation calls

RuleFor(x => x.DateOfBirthDay).NotEqual(0).WithMessage("bla bla bla");
RuleFor(x => x.DateOfBirthDay.Value).NotEmpty(0).WithMessage("bla bla bla");
RuleFor(x => x.DateOfBirthDay).NotNull().NotEqual(0).WithMessage("bla bla bla");
RuleFor(x => x.DateOfBirthDay.Value).GreaterThan(0).WithMessage("bla bla bla");

...but none of them work !!!

Any help will be truly appreciated.