using System;

using System.Globalization;

​

public class Program

{

    public static void Main()

    {

        DateTime  F1 = DateTime.ParseExact("21/11/2020 01:10:55", "dd/MM/yyyy HH:mm:ss", CultureInfo.InvariantCulture);

        DateTime F2 = DateTime.Parse(DateTime.Now.ToString());

        DateTime F3 = DateTime.Parse(DateTime.Now.AddDays(45).ToString());

        int diff = (F1 - F2).Days + 1;

        Console.WriteLine(F3);

        if(diff == 45){

            Console.WriteLine("Si");

        }else{

            Console.WriteLine("No");

        }

    }

}