As a calendar owner, I often have night events that start at ie. 8pm and goes into 1am or 2am. In the current web-based calendar, these events are displayed as 2 day events (personally, I consider any event that ends before dawn to be a single night event - ie. a Sat night event, not a Sat & Sun event).
I would like to see an option to select what time a day starts and ends in the local time zone.
Although the default could remain at midnight though, since it is actually correct and different parties may want different cutoffs. I would like to see the option to edit my end date (self select it) to the start date as needed.. ie. so if an event goes from Saturday at 8pm until 2am, I can edit the event so that it is displayed only as Saturday).