Java Basics: How To Add Days to Date Object Using Calendar Object?

#JavaInspires

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Welcome to Java Inspires.

In this post, we will see java program to add days to Date object in Java using Calendar Object.

Here, we create a date object then we convert date to calendar object. Then we add days using add method with Calendar.DATE parameter.

calendar.add(Calendar.DATE, n); // n is number of days.

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Here is the code.

package com.javainspires;

import java.util.Calendar;
import java.util.Date;

/**
 * 
 * @author #JavaInspires
 *
 */
public class JavaBasicMain {

	public static void main(String[] args) {

		// create a date object
		Date today = new Date();
		System.out.println("Today :" + today);

		// create calendar instance
		Calendar calendar = Calendar.getInstance();
		// Convert date object to calender object
		calendar.setTime(today);

		// to add one day to today
		calendar.add(Calendar.DATE, 1);

		// convert calendar to date
		Date tomorrow = calendar.getTime();
		System.out.println("Tomorrow :" + tomorrow);

		// to add two days
		calendar.setTime(today); // resetting to today
		calendar.add(Calendar.DATE, 2);
		Date dayAfterTomorrow = calendar.getTime();

		System.out.println("Day After Tomorrow :" + dayAfterTomorrow);

		// to add 10 days
		calendar.setTime(today); // resetting to today
		calendar.add(Calendar.DATE, 10);

		System.out.println("After 10 Days :" + calendar.getTime());

	}
}

Output: 

Today :Fri May 14 12:08:23 EDT 2021
Tomorrow :Sat May 15 12:08:23 EDT 2021
Day After Tomorrow :Sun May 16 12:08:23 EDT 2021
After 10 Days :Mon May 24 12:08:23 EDT 2021

Docs: https://docs.oracle.com/javase/8/docs/api/java/util/Date.html

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