For at least the last 17 years The Watchtower has just mentioned the year 607 BCE in its publications WITHOUT attempting to justify the year being the accurate year as opposed to the year 587BCE.
The reason is obvious, all their arguments for the 607 year have been completely demolished over 30 years ago through the research of Carl O. Jonsson. Jonsson published the results of his research in the book "The Gentile Times Reconsidered", a book which is easily ordered at Amazon.
The LAST time that The Watchtower attempted to give proof for 607BCE was in an article contained in the 1988 Insight books!!!
The Watchtower knows that their "reasoning" on this subject is bankrupt. So they just use 607 now in their publications and hope no one will start investigating.
--VM44