What I'm actually trying to get people to realize is that using JUST the time for this type of stuff (EndTime = StartTime + Duration) is the wrong thing to do unless it's ok to "wrap the clock" after midnight. If you have a duration that exceeds 24 hours starting just before midnight of one day, then you really need to show that the call or whatever duration your trying to portray ended two days later just after midnight.
In other words, both StartTime and EndTime must show the date AND the time for both.
--Jeff Moden
Change is inevitable... Change for the better is not.