Java tutorial
import java.time.Instant; import java.time.temporal.ChronoUnit; public class Main { public static void main(String[] args) { Instant t1 = Instant.now(); long hours = 2; long minutes = 30; Instant t2 = t1.plus(hours, ChronoUnit.HOURS).plus(minutes, ChronoUnit.MINUTES); System.out.println(String.format("now %s and later %s", t1, t2)); } }