Calendar entries being listed on "the day before"

  Like others I have been bothered by calendar entries showing up on the day before the event was supposed to occur, but so far I haven't seen any explanation being posted for this behavior.  After some experimentation, I've found that this is occurring when the event is entered as an "all-day" event in one time zone but is being read in a later time-zone.  I am in Pacific Time, for instance, but I'm looking at events entered in Eastern Time.

  Apparently the calendar is listing these events as occurring at midnight on the target date.  It then sees my time as being 9:00 pm the day before and says "whoops, I've got to adjust this event."

The calendar is a 3rd party add on.  It works really well for specified times, as for agendas with a starting time.   
Any entry manually added on the default month view will assume the event starts at midnight for the time zone the calendar is set to.
If the person entering an event uses the Week or Month button, and starts the event at the correct time, it will show correctly in the time zone of the viewer