The Watchtower, May 1, 1975, p285 - the WBTS began to lose its nerve as the months passed:
'F. W. Franz, the Society's vice-president, forcefully impressed on the audience the urgency of the Christian preaching work. He stressed that, according to dependable Bible chronology, 6,000 years of human history will end this coming September according to the lunar calendar. This coincides with a time when "the human species [is] about to starve itself to death," as well as its being faced with poisoning by pollution and destruction by nuclear weapons. Franz added: "There's no basis for believing that mankind, faced with what it now faces, can exist for the seventh thousand-year period" under the present system of things.
Does this mean that we know exactly when God will destroy this old system and establish a new one? Franz showed that we do not, for we do not know how short was the time interval between Adam's creation and the creation of Eve, at which point God's rest day of seven thousand years began. (Heb. 4:3, 4) But, he pointed out, "we should not think that this year of 1975 is of no significance to us," for the Bible proves that Jehovah is "the greatest chronologist" and "we have the anchor date, 1914, marking the end of the Gentile Times." So, he continued, "we are filled with anticipation for the near future, for our generation." - Matt. 24:34.'
We should also remember that:
Awake!, October 8,1966, p19 - the WBTS wrote:
"In what year, then, would the first 6,000 years of man's existence and also the first 6,000 years of God's rest day come to an end? The year 1975."
Of course, most Jehovah's Witnesses in 1966 would not know that a much earlier issue of The Watchtower magazine (The Watchtower, July 15, 1894, p1675) had declared that the 6,000 years of man's history would end in 1873!
This, in spite of 'God's channel' supposedly being in touch with 'Jehovah ... "the greatest chronologist"'!