Doing operations / handling DateTime

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Doing operations / handling DateTime

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#1 by (2 votes)
#2 by (2 votes)

2

The idea is for the user to type in a textbox a horaEntrada and in another the horaSaida in which case these 2 variables should have the format "HH: mm" hours and minutes, only, after that by method get and set there would assign the variables I mentioned above, after that I created the TempoPermanencia method in which the intention is to subtract between the hours and the minutes of these variables to be able to display the time that the person got parked on the computer screen

Follow the code:

    private string placa, modelo;
    private DateTime horaEntrada, horaSaida;

    public string Placa
    {
        get { return placa; }
        set { placa = value; }
    }

    public string Modelo
    {
        get { return modelo; }
        set { modelo = value; }
    }

    public DateTime HoraEntrada
    {
        get { return horaEntrada; }
        set { horaEntrada = value; }
    }

    public DateTime HoraSaida
    {
        get { return horaSaida; }
        set { horaSaida = value; }
    }

    public DateTime TempoPermanencia()
    {

    }

datetime c# .net time

asked by anonymous 03.11.2016 / 22:03

2 answers

2

I understood what you want.

If you do HoraEntrada - HoraSaida the return will be TimeSpan

The fields HoraEntrada and HoraSaida can be DateTime , it makes sense, since the car enters / leaves in a day and time

Must change the length of stay

public TimeSpan TempoPermanencia()
{
    return HoraSaida - HoraEntrada;
}

It can also be

return HoraSaida.Substract(HoraEntrada);

With the object TimeSpan you can format with hh: mm, it also has TotalDays , TotalHours , etc.

To display it would look something like this:

TempoPermanencia().ToString(@"hh\:mm\:ss")

03.11.2016 / 22:38

JSF panelGrid does not work Save and load objects within a list

score 2 · Accepted Answer

To calculate the difference, simply subtract it as follows:

public TimeSpan TempoPermanencia() {
    return HoraSaida - HoraEntrada;
}

This will produce a TimeSpan that is exactly what you need. DateTime , contrary to what many people think it is only a point in time, nothing more, so a moment of entry or exit is a point in time. A period, an amount of time spent on something is represented by TimeSpan . Read his documentation to learn how to use it, take the time stored from the various possible.

Ideally, do not just consider the hour and minute. Can not it be that the exit occurs the next day? Is not there any chance of this happening? Is it such a difference to disregard the seconds? If the seconds are not important, would not it be nice if they were dropped in the data entry? It would even be possible to do this on the property, but would have to use clear criteria. Without certain requirements, no code will be produced right.

I made a more "complete" solution that I do not guarantee that it does exactly what it wants, it lacks criteria to solve certain situations, for example, in the test done can give 1 hour and 43 minutes, or 1 hour and 44 minutes, but it is without clear criterion if this is what it should happen. I did not even try it. Stirring with date and time is much more complicated than it sounds. I cut the superfluous information on the property, but could have stored everything and make that cut account only at the time of calculation.

using System;
using static System.Console;

public class Program {
    public static void Main() {
        var objeto = new AlgumaClasse();
        objeto.HoraEntrada = DateTime.Now;
        objeto.HoraSaida = DateTime.Now.AddHours(1).AddMinutes(43).AddSeconds(22);
        WriteLine($"Permaneceu {(objeto.TempoPermanencia().ToString(@"hh\:mm"))}");
    }
}

class AlgumaClasse {
    public string Placa { get; set; }

    public string Modelo { get; set; }

    private DateTime horaEntrada;
    public DateTime HoraEntrada {
        get { return horaEntrada; }
        set {
            var tempo = default(DateTime).Add(value.TimeOfDay); //corta data
            horaEntrada = tempo.AddSeconds(-tempo.Second); //corta segundos
        }
    }

    private DateTime horaSaida;
    public DateTime HoraSaida {
        get { return horaSaida; }
        set {
            var tempo = default(DateTime).Add(value.TimeOfDay);
            horaSaida = tempo.AddSeconds(-tempo.Second);
        }
    }
    public TimeSpan TempoPermanencia() {
        return HoraSaida - HoraEntrada;
    }
}

See running on dotNetFiddle and on CodingGround .