Yes, this requires Advanced Clock Plugin. If there's demand theoretically it could be made into a stand-alone package derived from Wonko's Advanced Clock Plugin, using a more stripped down version of the Advanced Clock, but I personally don't have the time to undertake that right now, and I would feel a bit wrong doing that on top of Wonko's work unless there really was heavy demand for it. (And if I did, I might as well try to recode said stripped version in C instead of python for the efficiency, faster status-menu-load at boot, etc.)