using System;

public class Program

{

    private static DateTime targetTime = DateTime.Now;

    private static DateTime now = DateTime.Now;

    private static int nextDay = 0;

    public static void Main()

    {

        //Schedule Task

        now = DateTime.Now;

        int currentHour = now.Hour;

        string hourOfDay = "1,8,13,22";

        string[] arr = hourOfDay.Split(',');

        int nextTime = 0;

        for(int i = 0;i<arr.Length;i++){

            int element = Int32.Parse(arr[i]);

            if(element > currentHour){

                nextTime = i;

                break;

            }

        }

        Console.WriteLine(DateTime.Now);

        Console.WriteLine("Next time ["+nextTime+"] = "+arr[nextTime]);

        while(true){

            if(nextTime < arr.Length){

                int hour = Int32.Parse(arr[nextTime]);

                targetTime = DateTime.Now.AddDays(nextDay).Date.AddHours(hour);

                //targetTime = new DateTime(currentYear,currentMonth,day);

                if(targetTime > DateTime.Now){

                    string min = targetTime.Subtract(DateTime.Now).TotalMinutes.ToString();

                    Console.WriteLine("Countdown time in munutes: " + min);

                    break;          

                }

                if (targetTime == DateTime.Now)

                    {

                        nextTime++;

                    }

​

                if(nextTime == arr.Length)

                    {

                        nextTime = 0;

                        nextDay++;

​

                    }

            }  

        };

    }

}