As far as I know ''the last days'' which commenced began in 1914 & to this day the Borg has held on to that understanding. For a lack of better words, lately we hear ''we are in the last, of the last days'', something to that effect.
Lately, the Borg has done some real tinkering with the term ''generations''. Refining the Awake magazine in Nov 1995 was one of those ''refinements''. An additional ''refining'' I believe in 2010 I think it was something to do with ''overlapping generations''. Then lately, there seems to be an overlap, overlap generation of anointed.
Where I'm going with this , I will venture and say the Borg will likely not drop the 1914 date, but it will become less and less of any significance, mentioned less and less and eventually of no value at all.