How do you format the day of the month to say “11th”, “21st” or “23rd” (ordinal indicator)?

Question

I know this will give me the day of the month as a number (11, 21, 23):

SimpleDateFormat formatDayOfMonth = new Simple         


        

Answer 1

I wrote my self a helper method to get patterns for this.

public static String getPattern(int month) {
    String first = "MMMM dd";
    String last = ", yyyy";
    String pos = (month == 1 || month == 21 || month == 31) ? "'st'" : (month == 2 || month == 22) ? "'nd'" : (month == 3 || month == 23) ? "'rd'" : "'th'";
    return first + pos + last;
}

and then we can call it as

LocalDate localDate = LocalDate.now();//For reference
int month = localDate.getDayOfMonth();
DateTimeFormatter formatter = DateTimeFormatter.ofPattern(getPattern(month));
String date = localDate.format(formatter);
System.out.println(date);

the output is

December 12th, 2018