Issue 1367: Custom value for fixed Weekmode option.
Status:  WontFix
Owner: ----
Closed:  Aug 2013
Reported by heri.deH...@gmail.com, Apr 8, 2012
Instead of having 6 weeks per month for the "fixed" WeekMode, it would be great if we can customize the week number. 

Aug 15, 2013
Project Member #1 adamrs...@gmail.com
please use weekMode
http://arshaw.com/fullcalendar/docs/display/weekMode/

or see  issue 692 
Status: WontFix