How to get the difference between two DateTime in hour with C# ?

I am currently developing a mobile app with Xamrin.Forms and I had to know the difference between two DateTime in hours. It seems dumb, but in fact, it is quite tough to find a smart and optimised way to do it. I wanted to share with you the solution I found.


First, let's look at the basics.

Picture of a computer with code on the screen.


Here is a code snippet using this method to get the hour difference for training.

public int GetHourDifference(DateTime dateBefore, DateTime dateAfter)
  TimeSpan hourDifferenceSpan = dateAfter.Subtract(dateBefore);

  int hourDifference = hourDifferenceSpan.TotalHours;

  return hourDifference;

DateTime trainingBegin = DateTime.Today; // The training begins now
DateTime trainingEnd = DateTime.Today.AddHours(2);

Console.WriteLine("The training will last " + GerHourDifference(trainingBegin, trainingEnd) + " hours.");

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