Java 8 Duration example.

package com.java2novice.datetime;

import java.time.Duration;
import java.time.LocalTime;

public class DurationEx {

	public static void main(String a[]) {

		// create time object with values
		LocalTime givenTime = LocalTime.of(2, 30, 15);
		System.out.println("time: "+givenTime);

		// add 20 minutes and 30 seconds
		LocalTime updatedTime = givenTime.plus(Duration.ofMinutes(20)).plus(Duration.ofSeconds(30));
		System.out.println("updated time: "+updatedTime);

		Duration drt = Duration.between(givenTime, updatedTime);
		System.out.println("difference in seconds: "+drt.getSeconds());
		System.out.println("difference in seconds: "+drt.toMinutes());
	}
}

time: 02:30:15
updated time: 02:50:45
difference in seconds: 1230
difference in seconds: 20