Concerning Armageddon, did Jw's know:
The hour? No.
The day? No.
The week? No.
So maybe the "day for a year" principle applies here?
The year? No.
The decade? No.
The century? No.
Hmmm.. maybe the "with God one day is as a thousand years" principle applies here?
In that case, there's no way to pin-point it to even the closest 1000 years...