Run Dont Walk: according to my phone call to WTS "its only 20 yrs" this is not important to them, the 607BCE date is taking 537BCE the Cyrus decree that exiles could return to rebuild the walls PLUS 70 years of exile/desolation (a time period with many different thoughts of what consitutes the 70 years) add the 70 to 537and guess what you have 607 BCE.
Now when mentioning doing the math (thanks to KISS) from the mutally agreed pivitol date of 539 BCE taking the Babylonian Kings list from their publications and secular history and getting to 587BCE I was told that was because I was doing "traditional math", duh, hello!!!! No I must use the Bible only as to have the correct dates (bible does not give years) but that does not matter. But remember the Society has completely rewritten history backwards from their 607BCE date so all dates in the Watchtower, Awake, Books, Brochures, etc. are using dates that do not match anyone secular history but you will not find any disclaimers to this, thus the vast majority of JW's do not have a clue that these are not dates that the REST of the WORLD HISTORY accepts.
The Society will not give up 1914 because they loose 1919 as the appointed sole channel of God, therefore will continually uphold 607BCE.
Walks like a duck, quacks like a duck, but it's a DOG, per WTS.
As my mother would say "you lie down with dogs and you get fleas".
Peace
Sheri