WT has been wrong about this subject every time it has addressed it:
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"In this chapter we present the Bible evidence which indicates that six thousand years from the creation of Adam were complete with A.D. 1872; and hence that, since A.D. 1872 are chronologically entered upon the seventh thousand or the Millennium." (Studies in the Scriptures, Vol. 2, p. 33, 1889)
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*** jv chap. 28 pp. 631-632 Testing and Sifting From Within ***
It was only natural that they should wonder when and how these things would occur. Did the inspired Scriptures provide any clues?
Using Bible chronology that had first been laid out by Christopher Bowen of England, they thought that 6,000 years of human history had ended in 1873,
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*** ka chap. 11 p. 187 par. 6 “Here Is the Bridegroom!” ***
According to the Bible chronology that was thereafter adopted, the six thousand years of man’s existence on the earth ended in the year 1872 but the Lord Jesus did not come at the end of those six millenniums of human existence, rather, at the start of the antitypical Jubilee in October of 1874. The year 1874 was calculated as being the end of six millenniums of sin among mankind. From this latter date mankind was understood to be in the seventh millennium.—Revelation 20:4.
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"According to this trustworthy Bible chronology six thousand years from man's creation will end in 1975, and the seventh period of a thousand years of human history will begin in the fall of 1975 C.E Six thousand years of man's existence on earth will soon be up, yea within this generation. The rein of Christ...to run parallel with the 7th millennium ..." (Life Everlasting in Freedom of the Sons of God, 1966, p. 29-30)