There is another important indicator which might give some evidence to help answer the question: "When is Armageddon"?
Check out the scripture:
Revelation 16:12-16
12 And the sixth one poured out his bowl upon the great river Eu·phra´tes, and its water was dried up, that the way might be prepared for the kings from the rising of the sun.
13 And I saw three unclean inspired expressions [that looked] like frogs come out of the mouth of the dragon and out of the mouth of the wild beast and out of the mouth of the false prophet. 14 They are, in fact, expressions inspired by demons and perform signs, and they go forth to the kings of the entire inhabited earth, to gather them together to the war of the great day of God the Almighty.
15 "Look! I am coming as a thief. Happy is the one that stays awake and keeps his outer garments, that he may not walk naked and people look upon his shamefulness."
16 And they gathered them together to the place that is called in Hebrew Har–Ma·ged´on.
So if the great river Euphrates was to dry up we could be pretty sure that the gathering together to that place called "Armagedon" was actually happening.
It really would be something extraordinary for such an enormous river thats been around for thousands of years, to actually dry up!
From the evidence I have posted in the thread above however, the gathering to Armageddon has already been happening right under all our noses for about a hundred years now!
Those unclean inspired utterances that Jesus Christ warned us about, coming from the false prophet, have had spectacular effect!
abe