OnTimeForExam

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace OnTimeForExam
{
    class OnTimeForExam
    {
        static void Main(string[] args)
        {
            int startHours = int.Parse(Console.ReadLine());
            int startMinutes = int.Parse(Console.ReadLine());

            int hours = int.Parse(Console.ReadLine());
            int minutes = int.Parse(Console.ReadLine());

            TimeSpan startExam = new TimeSpan(startHours , startMinutes , 0);
            TimeSpan studentCom = new TimeSpan(hours , minutes , 0);

            TimeSpan time = startExam - studentCom;

            if(time.TotalMinutes < 0)
            {
                Console.WriteLine("Late");
            }
            else if(time.Minutes > 30 || time.Hours > 0)
            {
                Console.WriteLine("Early");
            }
            else
            {
                Console.WriteLine("On time");
            }

            if(time.TotalMinutes != 0)
            {
                if(time.TotalMinutes <= 59 && time.TotalMinutes > 0)
                {
                    Console.WriteLine("{0} minutes before the start", time.TotalMinutes);
                }
                else if(time.TotalMinutes > 59)
                {
                    Console.WriteLine("{0:%h}:{0:mm} hours before the start" , time);
                }
                else if(time.TotalMinutes < 0 && time.TotalMinutes >= -59)
                {
                    Console.WriteLine("{0} minutes after the start" ,Math.Abs(time.TotalMinutes));
                }
                else
                {
                    Console.WriteLine("{0:%h}:{0:mm} hours after the start" , time);
                }
            }
        }
    }
}