Interesting take on the JW month calculation being wrong for the beginning of the 70 years. There are broader issues here with the 7 times and when they began that they've gotten horribly wrong, that have greater implications for the basis and foundations of everything they believe.
What about the year? There is no archeological evidence for the 607 BCE date. 586/587 is the correct year. This has been debated on this site over and over again. But you have done research on this as well haven't you? What about the entire 2520 year reach that the Society has made? The 1914 date was originally contrived by Russell with measurements of the Great Pyramid in Giza Egypt. Once the Pyramid was discredited etc, the WTS had to find something in the Bible to fit their 1914 date. The classic making the Bible fit into their flawed belief here, rather than letting the scriptures explain themselves. Isn't that what they have been saying lately regarding the whole types and anti-type beliefs?
So its almost like a can't see the forest for the trees scenario here. I'm curious about what you actually believe about all of this, other than the month for the start of the 70 years. What about the date and the entire Society interpretation of this.