When manually entering an activity from the calendar view, the activity is saved with an incorrect time -- it seems to not be honoring my time zone setting.
I can repeat this behavior as follows:
--*-- Choose "Eastern time" as my local time zone.
--*-- Manually add an activity in the calendar view -- set the "Time" field to the time of the workout, say "11:30"
--*-- The activity will be entered in the calendar at a different time. In my case, it was "6:30", which happens to be the difference between UTC time and Eastern time.
Note that if you subsequently edit the activity and choose the time again, it is saved correctly.