Well then I guess that's for the Morris County system in general not just Denville. Though it would seem strange that different towns within a system get different dates.
I believe the Mine Hill Hub Office serves the greater Lake Hopatcong area. So I think the digital conversion dates vary according to the Hub Office (i.e., the place where the QAM modulators are located and the HFC (Access) network begins). I do not believe the Hub Office conversion dates are published, just the rather wide windows for the conversion of the entire system (Morris/Randolph in this case)