Adding days to a date in Java

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

/**

 * To add days in date

 * @author rajesh.kumar

 */

public class AddingDaysInDate {

      public static void main(String[] args) {

            SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");

            Calendar calendar = Calendar.getInstance();

            // Set current date in calendar instance.

            calendar.setTime(new Date());

            int days = 10;

            // Adding 10 days

            calendar.add(Calendar.DATE, days);

           

            String output = sdf.format(calendar.getTime());

            System.out.println("Date after "+days+ " : "+output);

           

           

            days = -10;

            // Adding 10 days

            calendar.add(Calendar.DATE, days);

           

            output = sdf.format(calendar.getTime());

            System.out.println("Date "+ Math.abs(days) + " before : "+output);

      }

}

Output:

      Date after 10 : 28/05/2016

      Date 10 before : 18/05/2016

           

void java.util.Calendar.add(int field, int amount)

Adds or subtracts the specified amount of time to the given calendar field, based on the calendar's rules. For example, to subtract 5 days from the current time of the calendar.

add(Calendar.DAY_OF_MONTH, -5).