I've tried modifying the end date, etc. and it just won't show on my Google or iCal. This is, of course, alarming. Other dates are syncing just fine. This is happening on a couple of dates, actually while other dates show up.
I also like to have some dates show up as ALL DAY events, so I don't use the time dialog, but simply list the time in the Heading. This is working on most events, but a few stubborn ones, it does not, and they show up as appointments.