Java Calculate Number of Seconds Between Two Calendar

Tags: Java Calendar TimeUnit DateUtil

In this Java tutorial, we learn how to calculate number seconds between two Calendar objects in Java programming language.

How to calculate number of seconds between two Calendar objects in Java

At this first step, we create a new Java utility class named DateUtil, and implement a new static method named getNumberOfSecondsBetween(Calendar start, Calendar end), this method follow these steps to calculate number of seconds between two Calendar objects.

  • Step 1: calculate number of milliseconds between start and end Calendar objects.
  • Step 2: convert number of milliseconds into number of seconds using the TimeUnit.SECONDS.convert(long sourceDuration, TimeUnit sourceUnit) method.

DateUtil.java 

import java.util.Calendar;
import java.util.concurrent.TimeUnit;

public class DateUtil {

    /**
     * This method to get number of seconds between two Calendar objects.
     * @param start the start Calendar object
     * @param end the end Calendar object
     * @return the number of seconds between start and end Calendar.
     */
    public static long getNumberOfSecondsBetween(Calendar start, Calendar end) {
        long numberOfMilliseconds = end.getTimeInMillis() - start.getTimeInMillis();
        long numberOfSeconds = TimeUnit.SECONDS.convert(numberOfMilliseconds, TimeUnit.MILLISECONDS);
        return numberOfSeconds;
    }

}

In the following example Java code, we learn how to use the above getNumberOfSecondsBetween(Calendar start, Calendar end) static method to calculate number of seconds between two Calendar objects in Java program.

NumberOfSecondsBetweenCalendarExample.java 

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

public class NumberOfSecondsBetweenCalendarExample {
    public static void main(String... args) {
        Calendar start = new GregorianCalendar(2022, Calendar.JULY, 1, 8, 10, 0);
        Calendar end = new GregorianCalendar(2022, Calendar.JULY, 1, 8, 11, 0);

        // Calculate Number of Seconds Between Two Calendar objects
        long numberOfSeconds = DateUtil.getNumberOfSecondsBetween(start, end);

        System.out.println("Start Date: " + start.getTime());
        System.out.println("End Date: " + end.getTime());
        System.out.println("Number of seconds: " + numberOfSeconds);
    }
}
The output as below. 
Start Date: Fri Jul 01 08:10:00 ICT 2022
End Date: Fri Jul 01 08:11:00 ICT 2022
Number of seconds: 60

Happy Coding 😊

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