Get number of days in Month in java

Learn about how to get number of days in Month in java.

Get number of days in Month in java

Using YearMonth’s lengthOfMonth() [Java 8]

You can use YearMonth‘s lengthOfMonth() method to get number of days in Month in java.

• Pass Year and month to YearMonth’s of and create YearMonth object.
• Call lengthOfMonth() on YearMonth’s object to get number of days in Month in java.

package org.arpit.java2blog;

import java.time.YearMonth;

public class GetNumberOfDaysInMonthJava {

    public static void main(String[] args) {
        // Get number of days in given month of the year
        int numberOfDaysInMonth1 = getNumberOfDaysInMonth(2019, 2);
        System.out.println("Number of days in Feb 2019: "+numberOfDaysInMonth1);

        int numberOfDaysInMonth2 = getNumberOfDaysInMonth(2020, 2);
        System.out.println("Number of days in Feb 2020: "+numberOfDaysInMonth2);

    }

    // Method to get number of days in month
    public static int getNumberOfDaysInMonth(int year,int month)
    {
        YearMonth yearMonthObject = YearMonth.of(year, month);
        int daysInMonth = yearMonthObject.lengthOfMonth();
        return daysInMonth;
    }
}

Output:

Using LocalDate’s lengthOfMonth [Java 8]

You can use LocalDate‘s lengthOfMonth() method to get number of days in Month in java.

• Pass Year and month to LocalDate’s of and create YearMonth object.
• Call lengthOfMonth() on LocalDate’s object to get number of days in Month in java.

package org.arpit.java2blog;

import java.time.LocalDate;

public class GetNumberOfDaysInMonthLocalDateJava {

    public static void main(String[] args) {

        // Get number of days in given month of the year
        int numberOfDaysInMonth1 = getNumberOfDaysInMonth(2019, 2);
        System.out.println("Number of days in Feb 2019: "+numberOfDaysInMonth1);

        int numberOfDaysInMonth2 = getNumberOfDaysInMonth(2020, 2);
        System.out.println("Number of days in Feb 2020: "+numberOfDaysInMonth2);
    }

    // Method to get number of days in month
    public static int getNumberOfDaysInMonth(int year,int month)
    {
        // LocalDate object
        LocalDate date = LocalDate.of(year, month, 1);
        return date.lengthOfMonth();
    }
}

Output:

Using Calendar

You can use Calendar’s getActualMaximum() to get number of days in Month in java.

• Create instance of Calendar object.
• Call Calendar’s getActualMaximum() to get number of days in Month in java.

package org.arpit.java2blog;

import java.util.Calendar;
import java.util.GregorianCalendar;

public class GetNumberOfDaysInMonthCalendarJava {

    public static void main(String[] args) {

        // Get number of days in given month of the year
        int numberOfDaysInMonth1 = getNumberOfDaysInMonth(2019, Calendar.FEBRUARY);
        System.out.println("Number of days in Feb 2019: "+numberOfDaysInMonth1);

        int numberOfDaysInMonth2 = getNumberOfDaysInMonth(2020, Calendar.FEBRUARY);
        System.out.println("Number of days in Feb 2020: "+numberOfDaysInMonth2);
    }

    // Method to get number of days in month
    public static int getNumberOfDaysInMonth(int year,int month)
    {
        // Create a calendar object and set year and month
        Calendar mycal = new GregorianCalendar(year, month, 1);
        int daysInMonth = mycal.getActualMaximum(Calendar.DAY_OF_MONTH);
        return daysInMonth;
    }
}

Output:

That’s all about how to get number of days in Month in java