var count = 0;
    for (var i = 1; i <= 12; i++) {
        for (var j = 1; j <= 31; j++) {
            var day =("0" + j).slice(-2)
            var dayten = Number( day.charAt(0));
            var dayone = Number(day.charAt(1));

            if (i == (dayten + dayone)) {
                count++
            }
        }
    }
    console.log(count);