I did not accept their explanation of 1975....
Why, the first question I had was, how long after Adam was created was Eve created. The 6th ended with Eve's creation, but their calculations went back into the 6th day making the 7th day perhaps start 30 days later perhaps making it 2005. Nearer 1975 they corrected that to be the same day in the Aid to Bible Understanding book. Add to that Matthew 24:44, Jesus said it would come at a time that we would not think it to be.
I knew to keep my mouth shut on that. I had seen my aunt chastised for her asking the question about the time gap.
Then when the end did not come, the lowly publishers were chastized for running ahead of god when it was the WTS/GB who had done the running.