Hi Shepherdless - sorry I misunderstood.
Hi Jeffro - you are missing the point - you have no need to go into any accession years. The entire thing is covered by 7 scriptures and at the end you realise - the date of the fall of Jerusalem is whatever you want it to be by whatever calendar you want. And providing that is consistent with the 41st year of Jeremiah's preaching - you are good to go. Oh and consistent with the 23rd year of Jeremiah's preaching...and.. oh I wont spoil the video series for you. :)
Someone else will be having a go at the dates on this thing - I will point you to the website at some point during the series of videos. But the dates wont be there immediately because it is work in progress and I can only do so much.
The key point you need to know about the 18th year of Nebuchadnezzar's rulership is that it is preceeeded by his 17th year of rulership and is followed by his 19th year of rulership. Also that the count to get to his 19th year of rulership starts with his 1st year of rulership, which is followed by 2nd, 3rd, 4th etc.
Its not difficult. Honest.