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Aritzbn
Asked: 2020-05-08 06:06:58 +0800 CST 2020-05-08 06:06:58 +0800 CST

How can I subtract two dates in c#?

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How can I subtract two dates in C#?

I have two variables DateTimeand I need to get the difference between them in hours.

DateTime fecharegistro = {04/05/2018 8:34:01} //obtenemos este valor de una base de datos
DateTime fechafin = DateTime.Now.Substract(fechaRegistro);

When compiling the above code I get an error saying that an object cannot be implicitly converted TimeStampto System.DateTime, when the variable is DateTime.

c#

3 Answers

  1. Best Answer

    The subtraction of 2 dates will never give you a DateTime, but a TimeSpan. If you want to know the number of hours, simply access TotalHoursthe subtraction property:

    DateTime fecharegistro = DateTime.Parse("04/05/2018 8:34:01"); //obtenemos este valor de una bbdd
var horas = (DateTime.Now-fecharegistro).TotalHours;

    PS there is no need to use the method Substractof DateTime. You can just subtract the dates ( fecha2-fecha1).

    If you want to format the output in a readable way, you can use a format, such as:

    var horas = (DateTime.Now - fecharegistro).ToString(@"dd\d\ hh\h\ mm\m\ ");

    This code returns a string of type04d 01h 44m

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  2. The addition or subtraction of dates returns a TimeSpan . Therefore you can get the hours directly from the result of that subtraction.

    var fecharegistro = DateTime.Parse("04/05/2018 8:34:01");
var timeSpan = DateTime.Now - fecharegistro;

Console.WriteLine(timeSpan.TotalHours);
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  3. To find the time difference between two objects of the class DateTimeyou can subtract them both, the result of this operation is an object of the class TimeSpan, for that reason it does not allow you to assign it to an object of the class DateTime. For that reason the compiler throws you that error.

    What is contained in the class object TimeSpanis the result of the subtraction of two dates, that is, of the time between both dates:

    TimeSpan tiempoDiferencia = DateTime.Now - fecharegistro;

    Depending on your needs, you can perform many operations between objects of classes TimeSpanand DateTime. You can also just use the object TimeSpangenerated from the subtraction of the two dates to print the difference time only.

    For example:

    Add the time difference to today's date:

    DateTime resultado = DateTime.Today + tiempoDiferencia;

    Add the time difference to the current time:

    DateTime resultado = DateTime.Now + tiempoDiferencia;

    Store the time difference between both dates as text:

    string tiempo = tiempoDiferencia.ToString();

    Print the time difference between both dates:

    Console.WriteLine(tiempoDiferencia.TotalHours);

    Among many other things.

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