using System;

public class Program

{

    public static void Main()

    {

        var horaInicial = new DateTime(2018, 08, 10, 10, 00, 00);

​

        var horaFinal = new DateTime(2018, 08, 18, 15, 00, 00);

​

        TimeSpan ts = horaFinal.Subtract(horaInicial);

​

​

        Console.WriteLine(ts.Days + " dias e " + ts.Hours + ":" + ts.Minutes);

    }

​

}

​