Earnest
The matter of the 586/587 BCE is crucial if one wishes to establish an accurate Bible Chronology and especially for those WT critics who are dogmatic in their criticism of 607 BCE. WT scholars use the same regnal data and in this case, we have the 18th and 19th years of Nebuchadnezzar which would be the acc or regnal years for the breaching of the city's wall synchronized to the 11 th year of Zedekiah. So, the difference is based on the fact of a different calendrical system as most scholars prefer but at what year of the monarch from to count or fix that event in history. In view of the KISS principle, it would be far more simple to adopt the viewpoint of the WT scholars rather than trying to interpret or create a chronology through the prism of different calenders used at that time which makes the matter extremely complicated.
There is much scholarly literature published on this problem as to what calenders were used at that time as to whether one should count from the Spring or the Autumn which creates a difference of 6 months. In short, this means that because of a different methodology scholars are unable to assign a precise date for the destruction of Jerusalem whereas WT scholars have used a different methodology have been able to assign a definite year namely 607 BCE for that event.
scholar