Java: Date Checking

Why does this not work; why do I suck at programming;


public static boolean validDate(int m, int d, int y){
        if (m == 1 || m == 3 || m == 5 || m == 7 || m == 8 || m == 10 || m == 12){
            if (d < 1 || d > 31)
                return false;
            return true;
        }else if (m == 4 || m == 6 || m == 9 || m == 11){
            if (d < 1 || d > 30)
                return false;
            return true;
        }else if (m == 2){
            if ( d < 1 || d > 29)
                return false;
            if (d == 29 && leapYear(y))
                return false;
            return true;
        }
        return false;
    }

it doesn't even work for absurdly wrong dates like 1234/1234/1234

>>21
fuck off and die you fucking faggot

>>19
fuck off and die you cock sucking faggot i fucking hate you