I would assume that for many of us who believed wts, coming to the conclusions that we had, didn't happen over night. Personally, I found out about wts involvement with UN probably three or four years prior to my DA. I believed they screwed up but still thought it was the truth. Then I found out about child abuse settlements and again wts covered it up but it still was the truth because we were the only ones preaching about Jehovah and paradise earth - right? But then I found Russell's book and after reading it I knew that this whole thing was a con but it took me another year of research to finally write a DA letter and still at that point I didn't want to call wts a cult but that it had cult like characteristics.
As you research more and compare actions of wts to that of other Christian cults, you will see a lot of similarities and as you step outside of the box you can clearly see how wts operates and that it in fact is a cult for which we've wasted our best years of our lives. It has taken away our opportunities, enjoyments of real life, it destroyed our marriages and for many it has destroyed entire family circles.
If you want a clearer understanding of dates and 607BC, start with Thy Kingdom Come. You'll understand what Russell actually taught and what wts taught regarding dates for over 50 years. If you don't have a problem reading xJW material as it appears you don't, you should read Carl Olof Jonnson's book, Gentiles Times Reconsidered. You'll be provided with enough secular material to see that 607BC is pure fiction but not only that, but wts knows it and are deceiving their own members regards to this date. Here's Jonnson's web site with his latest rebuttal to wts 607BC articles which you can read in pdf format at the bottom of his page. I strongly recommend reading Gentile Times Reconsidered.
Here's some info that you will discover when and if you do research on 607 myth.
From Russell's Thy Kingdom Come (Studies in the Scriptures Vol3)
1799 - Last Days began
1874 - 6000 years ended. Jesus returned invisibly. Most important date for WTS
1878 - Jesus was enthroned in heaven. Heavenly resurrection began.
1914 - end of gentile times, end of the worldly governments, restoration of Israel.Based on 536BC as date of Cyrus conquering Babylon. Where they assumed the 70 years applied to desolation of Jerusalem thus 606BC came about. (7 times prophesy)
- that was not the only support for 1914, but also 40 year harvest from 1874 to 1914 was corresponding to 40 years from JC baptism in 30AD to destruction of Jerusalem by the Romans
- there might have been another one or two supporting factors linking 1874 with 1914
All of the above dates were linked together by God's stone witness - Pyramid of Giza!!!!! WTS didn't just think these dates we true, they were certain of them and taught and preached these for many years after 1914. In fact, 1874 was officially replaced with 1914 in 1943! But the reasons given for the change evolved to what is taught today.
They faulted KJ bible for 100 years and also that there was no 0 year between 1BC and 1AD.
Today, Cyrus conquest of Babylon in 539BC is a pivotal year! Remember, Russell believed it was 536 (3 year difference).
But remember, 606/607BC had nothing to do with JC's return!!! It was the 6000 year calculation, so why didn't wts change 1874 to 1975 if the end of 6000 years had to do with the return of Christ?
Ya, 1914 was much more convenient to sell to the gullible public since WWI took place in that year! That is why we are told today that Russell pointed to 1914, some 40 years prior as if he had some foreknowledge. Today, no one at the door hears the real story behind 1914 and 1874, but the lie that the watchtower foreknown some 40 years prior to WWI. They are told that JC was to return invisibly and the householder is presented with "proof" how wts knew the war would take place. You show the householder some out of context BS that WTS pointed to 1914 and this impresses the householder as if wts was right! "The war did happen! JWs may know something, maybe I should listen to more what they have to say." Hell, as a kid I was impressed by this deception.