I am a Witness, I can answer for you.
do you know how that year 1914 for the return of Jesus was arrived at?
Assumption #1: Daniel 4:10-17 has two fulfillments, The first would be fulfilled on Nebuchadnezzar and the latter would be fulfilled on Jehovah's Sovereignty over the earth (whose sovereignty is supposedly represented by a Babylonian King).
There is, however, nothing in the text of Daniel 4 to indicate a secondary fulfillment. In fact, every element of the prophecy was also fulfilled in that same chapter. So the question arises: Why apply it as a second fulfillment?
Jesus said, "Jerusalem will be trampled on by the nations, until the appointed times of the nations are fulfilled." so obviously that means that Daniel's prophecy about "seven times" (which incidentally was not a prophecy of Daniel's, but rather a dream of Nebuchadnezzar's) applied to Jerusalem being trampled at some later date.
Seven times equals seven years, because the Governing Body says so and a couple of other prophecies were fulfilled that way. But its not just seven year, oh no! That would be too easy, it is seven years of years, not days. Hah! Clever, huh? Had you looking one way, and then [whoops!] jumped the other way. Head fake, serious head fake.
But it isn't really even seven years of years. It is really seven years of "prophetic years" (a concept not founded on Scripture) that are 360 days long. Now, you may be thinking, "Well, okay but I don't see any reason to apply fulfillments of other prophecies to this one unless the text indicates it."
Seven times 360 is 2520, from 607 B.C.E. (a starting point ONLY Jehovah's Witnesses use), application of "a day for a year" (again, not indicated in the text at all) brings you to 1914 A.D.
So, in 1914 Nebuchadnezzar finally got his kingdom restored to him, and merrymaking was enjoyed by all.
Respectfully,
OldSoul