From Jwfacts, some of the dates that were erroneously predicted
....we consider it an established truth that the final end of the kingdoms of this world, and the full establishment of the Kingdom of God, will be accomplished near the end of A.D. 1915.
1918 ed. We anticipate that the "earthquake" will occur early in 1918, and that the "fire" will come in the fall of 1920.
The Seventh-days before the Deluge may represent seven years, from 1914 to 1921, in the midst of which "week of years' the last members of the Messiah pass beyond the veil.
most effective work in the remaining months before Armageddon."Watchtower 1941 Sep 15 p.288
1980 ....if the wicked system of this world survived until the turn of the century, which is highly improbable
"Some of that "generation" could survive until the end of the century. But there are many indications that "the end" is much closer than that!" Watchtower1984 Mar 1 pp.18-19Shortly, within our twentieth century
"He was laying a foundation for a work that would be completed in our 20th century". Watchtower1989 Jan 1 p.12.
this very time
2003 We are certainly in "the time of the end."