I wanted to add the suffix of the day in Java (i.e. 1st, 2nd, 3rd, etc.). This is a small method that does the Job

public static String daySuffix(int dayOfMonth) {
        switch (dayOfMonth) {
            case 1:
            case 21:
            case 31:
                return "st";
            case 2:
            case 22:
                return "nd";
            case 3:
            case 23:
                return "rd";
            default:
                return "th";
        }
    }