using System;

using System.Collections.Generic;

​

using static System.Console;

​

//C# 7 is coming soon in VS 2017

//Try out some of the new features without having to install VS 2017 RC

​

//Source 1: http://www.c-sharpcorner.com/article/top-10-new-features-of-c-sharp-7-with-visual-studio-2017/

//Source 2: https://docs.microsoft.com/en-us/dotnet/articles/csharp/csharp-7

​

public class Program

{

    public static void Main()

    {

        DateTime dtoday = DateTime.Now;

        DateTime dend = dtoday.AddHours(1);

        Console.WriteLine($"sub ends: {dend}   today : {dtoday}");

        var dLeft = CalculateDaysLeftInSubscription(dend,dtoday);

        Console.WriteLine($"{dLeft}");

    }

​

     public static int? CalculateDaysLeftInSubscription(DateTime dateSubscriptionEnds, DateTime todaysDate)

        {

            var result = (decimal?)(dateSubscriptionEnds - todaysDate).TotalDays;

​

            Console.WriteLine($"{result}");

            var roundedVal = Math.Ceiling(result.Value);

​

            Console.WriteLine($"{roundedVal}");

            if (result > 0 && result < 1)

            {

                return 1;

            }

​

            if (result < 0)

            {

                return 0;

            }

​

            return (int)roundedVal;

        }

      public static int? CalculateDaysLeftInSubscriptionx(DateTime dateSubscriptionEnds, DateTime todaysDate)

        {

            var result = (decimal?)(dateSubscriptionEnds - todaysDate).TotalDays;

​

            var roundedVal = Math.Ceiling(result.Value);

          Console.WriteLine($"{roundedVal}");

​

            if (result < 0)

            {

                return 0;

            }

​

            return (int)roundedVal;

        }

}