if (xoops_smallworld.inArray('birthday', smallworlduseverification) > -1) {
                xoops_smallworld("input[name='birthday']").validate({
                    expression: "if (!isValidDate(parseInt(VAL.split('-')[2],10), parseInt(VAL.split('-')[1],10), parseInt(VAL.split('-')[0],10))) return false; else return true;",
                    message: SmallworldValidationBirthdayErrorMsg
                });