This was the teaching that finally forced me to look at all my beliefs critically. I had a basic understanding of how to arrive at that date in history, but never went any deeper. It took a history show about the ancient middle east, that I first heard the date of 587 B.C. It stuck in my head for a couple of days. I then decided to research the actual date for Jerusalems destruction.
Surprise surprise, no matter where I looked, only the WT uses 607.
I remember when I first tried to explain this to my wife, she didn't see the big deal. I remember thinking, how can anyone in their right mind not see what was sooooo obvious to me. Without that starting date, the whole 1914 doctrine falls apart.
She did eventually come around after I was DFed for apostacy, now we both laugh at how ridiculous we were back then. My wife has said now that if the WTs is God's organization, God is one sick puppy!!!