Ok... this is an interesting one, and I'm not sure why it's occurring.  I've gone over Drupal forums, and nothing yet.

I have a content type named **Event**.  It has a field name **Date**, which uses the jQuery pop-up with Repeat options.  It uses the To and From date, both of which are required.  The time zone conversion uses the "Site time zone".

On the Calendar view, I've modified it to use as the Argument, the Date field from the Event content type.  This is also added to the Fields, as it's required to match the Argument.  On Filters, I've got Node Type=Event and Published=Yes.

Now, I create an Event and set the Date field for 3/17/2011 03:00 pm to 3/17/2011 05:00pm.  I then put on the Repeat a repeat for "Every" "Day" until March 20, 2011, with no exceptions or anything else.

Immediately after submitting it, I see that the node display only has repeats for March 17, March 18, and March 19.  This is also reflected on the Calendar.  But, then when I open the node in edit mode, it says the Repeat Until is set to March 21 now.  If I save it now, March 20 shows up on the node display, but now the edit form shows March 22.

Any ideas what might be going on?  I've tried playing with the time zone settings, and no luck.  Any help would be appreciated!