Java Program for Add Two Dates with time

Java Program for Add Two Dates with time

In this program, I am going to explain how to add two dates in Java using Calendar.

If you want understand this example, you should have the knowledge of the following Java programming topics:

• Java Basic Input and Output
• Java Class and Objects

Since, Java epoch is 1970, any time represented in a Date object will not work. This means, your Dates will start from 1970 and when two Date objects are added, the sum misses by about 1970 years. So, we use Calendar instead.

Example: Java program for add two dates

import java.util.Calendar;

public class AddDatesandtime {

    public static void main(String[] args) {

        Calendar c1 = Calendar.getInstance();
        Calendar c2 = Calendar.getInstance();
        Calendar cTotal = (Calendar) c1.clone();

        cTotal.add(Calendar.YEAR, c2.get(Calendar.YEAR));
        cTotal.add(Calendar.MONTH, c2.get(Calendar.MONTH) + 1); // Zero-based months
        cTotal.add(Calendar.DATE, c2.get(Calendar.DATE));
        cTotal.add(Calendar.HOUR_OF_DAY, c2.get(Calendar.HOUR_OF_DAY));
        cTotal.add(Calendar.MINUTE, c2.get(Calendar.MINUTE));
        cTotal.add(Calendar.SECOND, c2.get(Calendar.SECOND));
        cTotal.add(Calendar.MILLISECOND, c2.get(Calendar.MILLISECOND));

        System.out.format("%s + %s = %s", c1.getTime(), c2.getTime(), cTotal.getTime());

    }
}

Output

Mon Sep 07 12:22:38 CEST 2020 + Mon Sep 07 12:22:38 CEST 2020 = Sat Jun 15 00:45:16 CEST 4041

In the above program, c1 and c2 stores the current date. Then, we simply clone c1 and add c2's each DateTime properties one after the other.

As you can see, we've added 1 to the months. This is because months start with 0 in Java.

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·       Java Program for Add Two Dates with time