[백준] 1408번 : 24 - C#

https://www.acmicpc.net/problem/1408

using System;

class Program
{
    static void Main() {
        string[] arr=Console.ReadLine().Split(':');
        int a1=int.Parse(arr[0]);
        int b1=int.Parse(arr[1]);
        int c1=int.Parse(arr[2]);
        string[] att=Console.ReadLine().Split(':');
        int a2=int.Parse(att[0]);
        int b2=int.Parse(att[1]);
        int c2=int.Parse(att[2]);
        
        int hour=a2-a1+23;
        int min=b2-b1+59;
        int sec=c2-c1+60;
        
        if(sec>=60){
          sec-=60;
          min+=1;
        }
        if(min>=60){
          min-=60;
          hour+=1;
        }
        if(hour>=24){
          hour-=24;
        }
        Console.Write("{0:D2}:{1:D2}:{2:D2}",hour,min,sec);
    }
}