View Code of Problem 56

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String time1 = scanner.nextLine();
        String time2 = scanner.nextLine();
        String[] x = time1.split(":");
        String[] y = time2.split(":");
        int t1 = Integer.parseInt(x[0]) * 3600 + Integer.parseInt(x[1]) * 60 + Integer.parseInt(x[2]);
        int t2 = Integer.parseInt(y[0]) * 3600 + Integer.parseInt(y[1]) * 60 + Integer.parseInt(y[2]);

        int res = Math.abs(t1 - t2);
        int h = res / 3600;
        int m = res % 3600 / 60;
        int s = res % 60;
        System.out.println(String.format("%d:%02d:%02d", h, m, s));
    }
}