Month firstDayOfYear() method in Java

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The firstDayOfYear() is a built-in method of the Month ENUM which is used to get the day of year corresponding to the first day of this month.

Syntax:

public int firstDayOfYear(boolean leapYear)

Parameters: This method accepts a single parameter leapYear, which is a boolean flag variable indicating whether this Year is a leap year or not.

Return Value: This method returns the day-of-year corresponding to the first day of this month.

Below programs illustrate the above method:

Program 1:

import java.time.*;
import java.time.Month;
import java.time.temporal.Temporal;
  
class DayOfWeekExample {
    public static void main(String[] args)
    {
        // Set the month to february
        Month month = Month.of(2);
  
        // Get corresponding day-of-year of the
        // first day of february in a non-leap year
        System.out.println(month.firstDayOfYear(false));
    }
}

Output:

Program 2:

import java.time.*;
import java.time.Month;
import java.time.temporal.Temporal;
  
class DayOfWeekExample {
    public static void main(String[] args)
    {
        // Set the month to february
        Month month = Month.of(3);
  
        // Get corresponding day-of-year of the
        // first day of March in a leap year
        System.out.println(month.firstDayOfYear(true));
    }
}