.NET Fiddle

CSharp · Console

/Program.cs

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));
		
	}
}