using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        Console.WriteLine(DateTime.Today.AddMonths(1).ToString());

        Console.WriteLine(DateTime.Today.ToString());

        Console.WriteLine(DateTime.Today.Subtract(DateTime.Today.AddDays(-5)).TotalDays.ToString());

        Console.WriteLine(DateTime.Today.AddDays(-5).Subtract(DateTime.Today).TotalDays.ToString());

        Console.WriteLine("Datetime Compare 1: " + DateTime.Compare(DateTime.Today.AddDays(-1), DateTime.Today));

        Console.WriteLine("Datetime Compare 1: " + DateTime.Compare(DateTime.Today.AddDays(-1), DateTime.Today.AddMonths(1)));

        DateTime expiryDate = DateTime.Today.AddDays(-1);

        Console.WriteLine(DateTime.Compare(expiryDate, DateTime.Today));

        Console.WriteLine(DateTime.Compare(expiryDate, DateTime.Today.AddMonths(1)));

        if(DateTime.Compare(expiryDate, DateTime.Today) == -1 && DateTime.Compare(expiryDate, DateTime.Today.AddMonths(1)) == -1 )

        {

            Console.WriteLine("Notify");       

        }

        else

        {           Console.WriteLine("Not Notify");       

​

        }

        Console.WriteLine("Datetime Compare 2: " + DateTime.Compare(DateTime.Today, DateTime.Today.AddDays(-5)));

        Console.WriteLine(DateTime.Today.AddMonths(1).Subtract(DateTime.Today).TotalDays.ToString());

    }

}