It may involve only a difference of weeks or months, not years
Keeping in mind that ALL the utterances coming forth from Brooklyn have been taught as truth, and expected to be accepted as such by the JWs. All the proofs mentioned above were all taught as "gospel truth" and each "revision" was see as new light.
Considering that God hasn't changed, Jesus hasn't changed and most of all---the bible hasn't changed-----we can plainly see that the Watchtower views have changed. What is taught as truth has proven to be in error. Many times.
As the bible says----no man knows the hour (let alone the year) and frankly, I don't worry about it. Living our lives to the best of our ability and being kind and helpful to others is what Jesus said to do----and should be quite enough to handle without concerning ourselves with the "what-ifs" of foolish old men who prophesy false dates and end times.
Annie