How Can I Format the Day of the Month with Ordinal Indicators in Java?

Formatting Day of Month with Ordinal Indicators

In Java, the SimpleDateFormat class provides a way to format dates and times. While the d format specifier displays the day of the month as a number, there is no built-in way to format the day with an ordinal indicator (e.g., 11th, 21st, 23rd).

Using Guava

The Google Guava library provides a utility class that can be used to generate the ordinal indicator for a given day of the month. The following code snippet demonstrates how to use Guava to format the day of the month with an ordinal indicator:

import static com.google.common.base.Preconditions.*;

public class DayOfMonthOrdinal {

    public static String getDayOfMonthSuffix(final int n) {
        checkNotNull(n);
        checkArgument(n >= 1 && n <= 31, "illegal day of month: " + n);
        if (n >= 11 && n <= 13) {
            return "th";
        }
        switch (n % 10) {
            case 1:
                return "st";
            case 2:
                return "nd";
            case 3:
                return "rd";
            default:
                return "th";
        }
    }

    public static void main(String[] args) {
        System.out.println(getDayOfMonthSuffix(11)); // 11th
        System.out.println(getDayOfMonthSuffix(21)); // 21st
        System.out.println(getDayOfMonthSuffix(23)); // 23rd
    }
}

Note: The Guava Preconditions class is used to perform input validation.

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