I believe they have for 1914 & 1925, but I may be missing some years.
Adding some info from the below source per request;
1899 "...the 'battle of the great day of God Almighty' (Revelation
16:14), which will end in A.D. 1914 with the complete overthrow of
earth's present rulership, is already commenced," (The Time Is at
Hand, 1908 edition, p. 101).
1918 "Therefore we may confidently expect that 1925 will mark the
return of Abraham, Isaac, Jacob and the faithful prophets of old,
particularly those named by the Apostle in Hebrews 11, to the
condition of human perfection," (Millions Now Living Will Never Die,
1922 "The date 1925 is even more distinctly indicated by the
Scriptures than 1914," (Watchtower, Sept. 1, 1922, p. 262).
1923 "Our thought is, that 1925 is definitely settled by the
Scriptures. As to Noah, the Christian now has much more upon which to
base his faith than Noah had upon which to base his faith in a coming
deluge," (Watchtower, Apr. 1, 1923, p. 106).
Below indicate the claim to be prophets;
"So does Jehovah have a prophet to help them, to warn them of dangers
and to declare things to come? These questions can be answered in the
affirmative. Who is this prophet?...This "prophet" was not one man,
but was a body of men and women. It was the small group of footstep
followers of Jesus Christ, known at that time as International Bible
Students. Today they are known as Jehovah's Christian Witnesses...Of
course, it is easy to say that this group acts as a 'prophet' of God.
It is another thing to prove it," (Watchtower, Apr. 1, 1972, p. 197).
(See Deut. 18:21.)
All taken from this Source