HourCouter, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var horaDoVelti = "09:23	12:08	13:08";
            var horaTeste = horaDoVelti.Split('	');
                     
            var horarioDeEntrada = Converter(horaTeste[0].Trim());
            var horarioDeAlmocoEnt = Converter(horaTeste[1].Trim());
            var horarioDeAlmocoSai = Converter(horaTeste[2].Trim());
            var horarioDeSaida = Converter(string.Format("{0}:{1}", HoraAtual().Hour, HoraAtual().Minute));
            
            //Your code goes here
            var entrada = DateTime.Now.Date.AddHours(horarioDeEntrada.Hora).AddMinutes(horarioDeEntrada.Minuto);
            var entAlmoco = DateTime.Now.Date.AddHours(horarioDeAlmocoEnt.Hora).AddMinutes(horarioDeAlmocoEnt.Minuto);
            var saiAlmoco = DateTime.Now.Date.AddHours(horarioDeAlmocoSai.Hora).AddMinutes(horarioDeAlmocoSai.Minuto);
            var saida = DateTime.Now.Date.AddHours(horarioDeSaida.Hora).AddMinutes(horarioDeSaida.Minuto);
            var padrao = new TimeSpan(8,30,0);
			
			TimeSpan tempo = saida - entrada - (saiAlmoco - entAlmoco);
            TimeSpan restante = padrao - tempo;
            
            Console.WriteLine("Deveria sair: " + (entrada + padrao + (saiAlmoco - entAlmoco)).ToString("HH:mm:ss"));
            Console.WriteLine("Se sair agora da: " + tempo);
            Console.WriteLine("Fica faltando: " + restante);
        }
        
        public static DateTime HoraAtual() { return TimeZoneInfo.ConvertTime(DateTime.Now, TimeZoneInfo.FindSystemTimeZoneById("E. South America Standard Time"));}

public static Horario Converter(string hora)
        {
            var sep = hora.Split(':');
            return new Horario(){Hora = int.Parse(sep[0]), Minuto = int.Parse(sep[1])};
        }
    }
    
    public class Horario
    {
        public int Hora { get; set; }
        public int Minuto { get; set; }
    }
}

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Compilation time: 0,16 sec, absolute running time: 0,13 sec, cpu time: 0,11 sec, average memory usage: 16 Mb, average nr of threads: 3, absolute service time: 0,31 sec