receive an add'l header, the offset in minutes from UTC for this client
When updating a conference, the timezone offset (from UTC) is required.
 - when saving times in the database, they are stored in UTC with a timezone offset, the timezone the user is currently in.
 - on each conference, the user saves a target timezone for the the conference.
 - when saving times, since javascript clients automatically pass the time in the timezone the user's computer is set to, the saved time is altered by the delta b/w the user's timezone and the target timezone for the conference.
 - when times are returned, they are converted to the target timezone for the conference.
   - the actual value isn't changed, it's just that it's returned as a timestamp with the timezone included.  the web client will know from this timezone how to display the time.
   - example: for any given day at 5:00 AM instead of returning MM/dd/yyyy 05:00Z, MM/dd/yyyy 01:00-04:00 is returned for EDT.