However, there is a minor problem that he has overlooked. Indeed, it seems to be a problem in all the date calculations on this website which transcend the birth of Christ, and most prophecy websites make the same error. This is not a criticism but a correction, because it is a point I also once overlooked.
It's generally best to pose things as questions, rather than all caps emphatic declarations, when the subject is Ellis Skolfield's knowledge. If you had ever engaged in lengthy discussion with him you would have no doubt whatsoever about his knowledge of scripture, languages, Christian apologetics, history, archaeology and his scholarship, so let me help you get to know him.
Besides a lifetime of independent study, after his being raised in the scriptures on his mother's knee as
missionaries in the Philippines (his father captained the "Gospel Ship"), he was also a pastor trained at Columbia Bible College, who led a flock earlier in life. He was also working in the world for a considerable portion of his life as an internationally recognized and award winning graphic designer/printer.
Over the 35-40 years of Ellis teaching on the math this is not the first time the "zero year" came up. Ellis not only didn't overlook it, but rather addresses it along with its irrelevance, in several places. It is settled by the fact that scholars accept 1-2 years of leeway in dating of the Babylonian period (as you indicated yourself). Voila, "zero year" discussion is rendered moot and both years you list are recognized.
Ellis avoided increasing the complication of his books, by excluding subjects like a zero year, since no shortage of folk's eyes glaze over simply at the mention of mathematics. Another example is, in "Hidden Beast" he included a chapter on bifids and chiasms, but dropped it from his later books because he didn't want to discourage or otherwise wear out the reader, with such technical information. At first blush, it might seem to you and I that later readers got gypped out of that essential information (which was of course still available in PDF on his site), but over the years I learned to trust in Ellis' conspicuously Spirit-guided judgment.
Additionally, when I present the dating on my websites and elsewhere, I usually include a range as in Belshazzar 553-552 BC and first year of Cyrus 537-536 BC, which has the added benefit of additional web search results that confirm the dating as supportable.
Before going off further in critique on the dating, you might want to glance at a fairly lengthy chat I had with an atheist who put a lot of effort into
disbelieving the dating, that forced me a little deeper into more specifics:
http://www.islamchristianforum.com/index.php?topic=4691.msg17839#msg17839In conclusion, since the verses work out so stunningly well textually, do we really need to quibble over a year much less look to some liberal scholar's dating, or trust the word of God and the math to determine the dating?