Question

What is the C# optimised version of the following, without using .Net’s Timespan or DateTime. How would I NUnit test it?

TimeSpan ts = Date1 - Date2; int numberOfDays = ts.Days; 

Answer 1

You could convert the dates to ticks, substract, then convert the ticks back to days. Though exactly why can’t you use TimeSpan? It’s likely doing just that.

Something like this:

      DateTime a = DateTime.Now;       DateTime b = a.AddDays(2);        // ticks are in hns       long ticks = b.Ticks - a.Ticks;       long seconds = ticks / 10000000;       long minutes = seconds / 60;       long hours = minutes / 60;       long days = hours / 24; 

I get back ‘2’ for days.