using System;

public class Program

{

    public static void Main()

    {

        DateTime entrada = new DateTime(2017,07,27, 20,12,0,0); //entrou em 27/07 as 20 horas

        DateTime saida = new DateTime(2017,07,28, 7,28,0,0); //saiu no dia seguinte as 7 horas

        TimeSpan horas = saida - entrada;

        Console.WriteLine(string.Format("Total de {0} horas e {1} minutos trabalhadas", horas.Hours, horas.Minutes));

    }

}