It is all in the approach. As a woman, I learned to frame things as a question, wanting info that I could use to explain things to a non-jw. Thus I did not get in "trouble." But I did give people something to think about.
1. The 7th creative day started right after Eve was created yet the 6,000 years the WTS calculated started with the creation of Adam some time before Eve's creation. Thus the WTS saying that 1975 was 6,000 years of human history, not 6,000 years into the 7th creative day. That means that there was the time period between Adam's creation and Eve's. The Bible is silent on its duration. And since Jesus was present and helping God create per the WTS, he would have known what that time period was and would not have said he did not know "the day and the hour" (Mt 24:36). The WTS chose to assume that Eve was created only a year after Adam thus making 1975 a viable date. But the bible does not say.
2. Mt. 24:42 Keep on the watch, therefore, because YOU do not know on what day YOUR Lord is coming.
Mt 24:44 On this account YOU too prove yourselves ready, because at an hour that YOU do not think to be it, the Son of man is coming.
So Jesus not only said it could not be calculated, that if you tried, you'd be wrong....so what would I say to a householder that used these scriptures.
"Aid" book claimed Adam and Eve were created in the same year:
Adam at age 130 had a son, Seth --Aid to Bible Understanding, p.333Eve at age 130 had a son, Seth -- Aid to Bible Understanding, p.538
"According to reliable Bible chronology, Adam and Eve were created in 4026 B.C.E" Awake, Oct. 8, 1968, p.14
". . .it is logical that He (God) would create Eve soon after Adam, perhaps just a few weeks or months later in the same year, 4026 B.C.E." Watchtower, May 1, 1968, p.271
Then in October of 1975 the WTS finally saw (or had God reveal!) what a non-anointed woman had know for 9 years.
*** w75 10/1 p. 579 The End of 6,000 Years of Man-Rule Approaches—What Has Been Accomplished? ***
SINCE a new Jewish lunar year began in September 1975 a significant point in human history was reached. What was that? According to the Bible’s count of time, mankind then completed 6,000 years of existence on earth. Yes, the first man Adam, if he had chosen to remain obedient under God’s rulership, would have still been alive and 6,000 years old in September of this year.
Does this mean, then, that mankind has now reached 6,000 years into the 7,000-year period that God ‘blessed and made sacred’ as his great “rest day”? Does it mean that Christ’s millennial Kingdom rule, as the final 1,000 years of that “rest day,” is to be reckoned from September 1975?—Gen. 1:27, 31; 2:2, 3; Rev. 20:1-6.
No, it does not mean that. Why not? Well, the Bible record shows that God’s creations on the “day” just preceding that 7,000-year “rest day” did not end with Adam’s creation. It shows a time lapse between the creation of Adam and that of his wife, Eve. During that time, God had Adam name the animals. Whether that period amounted to weeks or months or years, we do not know. So we do not know exactly when Jehovah’s great “rest day” began, nor do we know exactly when it will end. The same applies to the beginning of Christ’s millennial reign. The Bible provides us no way to fix the date, and so it does us no good to speculate when that date may be.—Gen. 2:18-25; Matt. 24:42, 44.
However, the Bible’s time clock does indicate to us that 6,000 years of human history end in this year 1975. Early in God’s “rest day” Adam became a rebel against God-rule. Thus, for the most part, the first 6,000 years of man’s history have been marked by man-rule. What did man’s independent rulership accomplish during those six millenniums of time, or six spans of 1,000 years each? Let us take a panoramic view of those millenniums, each in its turn.