jQuery Validate additional validation for dates in the format dd.mm.yyyy

_validateDateDACH.js

/* Additional method for jquery validate
Valiate dates in the format dd.mm.yyyy
------------------------------------- */
jQuery.validator.addMethod(
    "dateDECH",
    function(value, element) {
        var check = false;
        var re = /^\d{1,2}\.\d{1,2}\.\d{4}$/;
        if( re.test(value)){
            var adata = value.split('.');
            var dd = parseInt(adata[0],10);
            var mm = parseInt(adata[1],10);
            var yyyy = parseInt(adata[2],10);
            var xdata = new Date(yyyy,mm-1,dd);
            if ( ( xdata.getFullYear() === yyyy ) && ( xdata.getMonth () === mm - 1 ) && ( xdata.getDate() === dd ) ) {
                check = true;
            }
            else {
                check = false;
            }
        } else {
            check = false;
        }
        return this.optional(element) || check;
    },
    "Geben Sie bitte ein korrektes Datum ein!"
);