* Because we were sending these in the wrong format, upsynced changes
were failing, with the result that both the original event and
the "new" event (from the UNTIL date forward) remained in the calendar
* Fix is to send the proper format; unit test updated to reflect the
change
* Also, we only send the date of an UNTIL, rather than the to-the-minute
time; it turns out that EAS expects to see only a day for UNTIL.
Bug: 2561818
Change-Id: Ic4eacbe96c713d58c637386ceab2cf22ebe3c2d4
cf274512ed