custom validation method

custom validation method

Hi all,
Im sure this is simple, but man its frustrating! I need to add a custom validation method for a date in the following format MM/YYYY the slash between the 2 digit month and 4 digit year is giving me some issues. This will be used with jquery.validation.js  Has anyone had this issue or know how to solve it?

This isn't working as I want it still expects a day

$.validator.addMethod("dateCC",function(value, element) {
            var check = false;
            var re = /^\d{1,2}\/\d{4}$/;
            if( re.test(value)){
                var adata = value.split('/');
                var mm = parseInt(adata[1],10);
                var aaaa = parseInt(adata[2],10);
                var xdata = new Date(aaaa,mm-1);
                if ( ( xdata.getFullYear() == aaaa ) && ( xdata.getMonth () == mm - 1 ) )
                    check = true;
                else
                    check = false;
            } else
                check = false;
            return this.optional(element) || check;
        },
        "Please enter a correct date in MM/YYYY format"
    );
thanks,