How to deal with Rounding-off TimeSpan?

Question

I take the difference between two DateTime fields, and store it in a TimeSpan variable, Now I have to round-off the TimeSpan by the following rules:

if the minutes i

Answer 1

You can use

double v = span.TotalHours;     
v = Math.Round(v, MidpointRounding.AwayFromZero);
span = TimeSpan.FromHours(v);

It depends on whether I understood your rules for negative values correctly.