Date Validator

gistfile1.bas

    Protected Sub DateValidator_ServerValidate(ByVal source As Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs) Handles DateValidator.ServerValidate
        args.IsValid = DateTime.TryParse(args.Value, New DateTime())
    End Sub

gistfile2.js

var isDateValid = function (source, arguments) {
	arguments.IsValid = (Date.parse(arguments.Value) != null);
};