Actually, now that I am further into it I see that it is probably not a problem with interval. Its clearly a display bug since if you put in an event for 8am to 9am and then another one for 9am - 10am, the two events overlap for a half hour @ 9:30 when they clearly should not. This is a problem with the end time being displayed one interval too long ( in my case 30 mins too long). Surely I can't be the first one to notice this. Please let me know if there is something I can do since I really need to be able to use the week view instead of the list view.

I've never noticed it before, but you're right: two adjacent events are rendered overlapping. It's probably no bug - more a not well thought-out table design.

But there's a workaround: in file /DesktopModules/Events/EventWeek.ascx, go to line 34 and change the value of the attribute IncludeEndValue to "False". This will slightly change the way that the control <cc1:schedulecalendar> renders the time column.