I am making a fullCalendar backed car reservation functionality. This is the coffescript file.
updateEvent = (event, delta, revertFunc) ->
$.aja
If you are setting your end date for 0 hours, min, sec, etc of 12-21-2014 there is no time in that day for an event to show.
You may need to advance your end date to 0 hours of the next day since you have the event setup as an all day event, however uou may also be fine just advancing the time any amount (such as an hour) so that the event falls inside of the desired end date, then being an all day event it should render.
It would be nice if their event object included a duration parameter you could set, at least I didn't see one in their documentation.