Anna Marina
Well I am certain because I know the Bible and I know that when Dan 1:1 speaks of the 3rd year of Jehoiakim's rulership, it means... the 3rd year of Jehoiakim's rulership.
You are sadly mistaken in your inference for Dan.1:1 correctly rendered in the NWT refers not to the third year of Jehoiakim's reign as in most other translations but to the third year of his kingship or as you put it 'rulership' so this understanding has implications for Chronology nicely affixing 607 BCE as the correct date for the Fall of Jerusalem leading to the end of the Gentile Times in 1914 CE.
scholar JW emeritus