Java MonthDay

The Java MonthDay class is an immutable and thread-safe class that represents the combination of a month and day-of-month. The MonthDay class can be used to store information in the following format “April 22nd”.

How to use

This class does not handle or represent a year, time or time-zone, as it does not maintain a year, the leap day of February 29th is considered valid. Try the following examples to better understand –

At year example

The following example program shows how you can atYear() function with MonthDay.

MonthDayExample1.javaCopy
import java.time.LocalDate;
import java.time.MonthDay;

public class MonthDayExample1 {

    public static void main(String[] args) {

        // Get a instance of MonthDay
        MonthDay monthDay = MonthDay.now();
        System.out.println(monthDay);

        // At year example
        LocalDate date = monthDay.atYear(1990);
        System.out.println(date);
    }
}
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Valid year example

The following example program shows how you can check year is valid or not.

MonthDayExample2.javaCopy
import java.time.MonthDay;

public class MonthDayExample2 {

    public static void main(String[] args) {

        // Get a instance of MonthDay
        MonthDay monthDay = MonthDay.now();

        // Is valid year?
        System.out.println(monthDay.isValidYear(2019));
    }
}
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Fields example

The following example program shows how you can get different fields.

MonthDayExample3.javaCopy
import java.time.MonthDay;
import java.time.temporal.ChronoField;

public class MonthDayExample3 {

    public static void main(String[] args) {

        // Get a instance of MonthDay
        MonthDay monthDay = MonthDay.now();

        // Get day of month
        int dayOfMonth = monthDay.get(ChronoField.DAY_OF_MONTH);
        System.out.println(dayOfMonth);

        // Get month of year
        int monthOfYear = monthDay.get(ChronoField.MONTH_OF_YEAR);
        System.out.println(monthOfYear);
    }
}
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