Write a Java Program to Add Two Dates

In Java, it is possible to add two dates together by using the Calendar class.

This class provides methods to add or subtract values from specific fields of a given date.

Here is a simple program to add two dates:

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

public class AddTwoDates {

  public static void main(String[] args) {
    Calendar cal1 = Calendar.getInstance();
    Calendar cal2 = Calendar.getInstance();
    Date date1 = new Date(2022, 1, 1);
    Date date2 = new Date(2023, 1, 1);
    cal1.setTime(date1);
    cal2.setTime(date2);
    cal1.add(Calendar.DATE, cal2.get(Calendar.DATE));
    cal1.add(Calendar.MONTH, cal2.get(Calendar.MONTH));
    cal1.add(Calendar.YEAR, cal2.get(Calendar.YEAR));
    Date resultDate = cal1.getTime();
    System.out.println(resultDate);
  }

}

In this program, we create two instances of the Calendar class, cal1 and cal2, and two instances of the Date class, date1 and date2.

We then set the time of each Calendar instance to the corresponding date using the setTime method.

Next, we add the values of each field of cal2 to the corresponding field of cal1 using the add method.

Finally, we get the resulting date by calling the getTime method of cal1 and print it to the console using System.out.println.

Note that the Date constructor used in this program is deprecated and it is recommended to use the Calendar class instead to create dates.

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