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Andy, I do not have any problems with the dates; multiple tests done. Please note that you could have a different time zone than the user adding the events, this could give another time than the one entered. When you use tab to go to the next field it is also possible that the date/time changes to the date filled in at the Begin date/hour.
I also tested the permissions further: The events from a user with no auto approve show not in the list with items to approve but in the Home admin screen my events to approve show me one extra. Even when the user is able to auto approve, it counts up with one extra.
It is also visible for non-registered users in the calendar.
Besides this I do not seem to have any other problems with the permissions.
I will look further to the locations and the other functions Extcal has.