How do I test if two dates are within a certain tolerance in NUnit?

Question

How do I test if two dates are within a certain tolerance in NUnit?

Answer 1

You may want to look at the "Within" method that lives off of the Constraint object.

For example:

Assert.That(DateTime.Now, Is.EqualTo(DateTime.Now.AddMilliseconds(1000)).Within(101));

It's usually used to give a tolerance to doubles and floats, but since in the end a DateTime is a double, it might suit your needs.

Answer 2

TimeSpan tolerance = new TimeSpan(0,1,0);  // e.g. 1 minute

Assert.IsTrue((firstDateTime-SecondDateTime).Duration() > tolerance);