Ancient Chronology is a subject fraught with difficulties(a) as well as the focus of intense academic debate, particularly over the past half-century.
Archbishop Ussher (1581-1656) calculated the date of creation to have been October 23rd 4004 BC(d). Incredible as it may seem, even today (2019), there are still people prepared to give further consideration to his ideas (c)(e).
Sir Isaac Newton (1642-1727) became the first ‘modern’ revisionist of accepted ancient chronology. His work was heavily criticised and few serious advances were made until the development of Egyptology following Napoleon’s invasion of Egypt at the end of the 18th century.
Difficulties with details of Egyptian dating slowly accumulated, particularly when endeavouring to align it with Greek, Minoan and other eastern chronologies. The scholarly debates became very public in the middle of the 20th century with the eventual publication of Ages in Chaos by Immanuel Velikovsky and the attempts made to suppress it altogether. The refining of Velikovsky’s theories followed, with important contributions by S. Talbott, Edward Schorr and John Bimson.
The Society for Interdisciplinary Studies (SIS)(b) was founded in 1974 and produces regular publications. This was followed a few years later by three important books by David Rohl and Centuries of Darkness  by Peter James, who also wrote The Sunken Kingdom in which he places Atlantis in Turkey. Rohl & James were in agreement on many details, but fell out over the identity of Shishak (was he Ramesses II or III?),
On the occasion of the SIS Jubilee Conference in 1999 a paper by P. John Crowe was presented, which gave a valuable insight into historical revisionism before and after Velikovsky(a).
Gunnar Heinsohn (1943- ) is Professor Emeritus at the University of Bremen but is also an ardent chronology revisionist, concerned not just with the dating problems of the ancient world(l) but also with difficulties to be seen in the first millennium of the Common Era(m).
One of the most controversial aspects of Plato’s Atlantis story is the old Egyptian priest’s claim that Atlantis was destroyed 9,000 years before Solon’s visit. He also related that Athens, who fought the Atlanteans, was established one thousand years before the Egyptian state or as is more likely, before the foundation of the city of Sais. Apart from anachronisms in Plato’s narrative, the archaeological evidence completely contradicts the dates seemingly offered by the priests of Sais. It is interesting that most of the chronology revisionist debate centres on the second millennium BC which is arguably the most rational timeframe for the destruction of Atlantis based on the Bronze Age references in Timaeus and Critias, provided they are not just anachronistic embellishments.
I should also mention that while the debates regarding the Bronze Age chronologies rage on, further controversy has arisen regarding claims of duplicated centuries in the first millennium of our era. Leading the charge here are Anatoly Fomenko(k) , Heribert Illig(h)(i)(j) and Gunnar Heinsohn(g). A keen supporter of Fomenko’s work is Garry Kasparov the former Chess World Champion(p).
Up to this point, I have outlined some of the problems and theories concerning the accurate alignment of specific events with particular years. A clash of archaeology and accepted history, secular and religious. has generated libraries of debate. However, our problems do not end with the counting of years, but contention has also arisen over the length of the day before the seventh century BC. Evidence is available to show that there was a 360-day year in use around the world in those ancient times.
Some religious sites have proposed that before the Deluge we had a 365-day year, then it changed to 360 days and then reverted to the current 365.2422 days(q).>By way of complete contrast Danny Faulkner, a creationist astronomer rejects the idea that the world was created with a 360-day year, although it is a view held by many creationists(r).
William Whiston was one of the first ‘modern’ commentators to conclude that in very ancient times a 360-day year was used(n). More recently, Immanuel Velikovsky devoted a chapter of Worlds in Collision to The Year of 360 Days(o). The Brit-Am movement endorsed Velikovsky’s views in this regard, as does William F. Drankenbring.<
(o) I. Velikovsky, Worlds in Collision, Part 2, Chapter Viii, p.316
David Rohl (1950- ) holds a degree in Ancient History and Egyptology from University College London. He is a former rock musician and is the author of three best-selling history books that controversially proposed a New Chronology for the ancient eastern Mediterranean and has presented television documentary programmes on the same subject, which have provoked severe criticism(a).
Bryant G. Wood, an American biblical archaeologist, disputes the validity of Rohl’s revised chronology as he sees it as an attack on his belief in the veracity of the Bible(f).
Drawing some inspiration from the work[1388/9] of Reginald A. Walker (1917-1989), Rohl has also argued for the Garden of Eden being situated in what is now northwestern Iran. Equally controversial is Rohl’s claim that the biblical Tower of Babel was sited at the Sumerian city of Eridu. This claim was explored in detail on Yesterday Channel’s, Secrets of the Bible series (S1 E8).
Unexpectedly, he has written an introduction to Andrew Collins’ bestseller, Gateway to Atlantis, in which he expresses his regret for the lack of firm archaeological evidence to support the existence of Atlantis, but is clearly sympathetic to the idea and is somewhat supportive of an Atlantic location. He repeated and expanded on his views at a subsequent lecture(b).
Rohl also proposed that the Shardana, one of the Sea Peoples, originally came from Sardis in Lydia and later established the Nuragic Culture on Sardinia [232.449]. Recently, Angelo Paratico propounded the same idea during a lecture in Hong Kong in 2004(d). Perhaps more pertinent is a Wikipedia entry which notes that “According to Timaeus, one of Plato’s dialogues, Sardinia and its people as well, the “Sardonioi” or “Sardianoi”, might have been named after “Sardò”, a legendary woman from Sardis, capital of the ancient Kingdom of Lydia in Anatolia.”(e)
Peter James is another high profile historian who has advocated a similar radical revision of the chronologies of the Mediterranean and Near East. In fact, James and Rohl had collaborated until they had divergent views regarding the identification of the biblical Shishak(c), Rohl favouring Ramesses II, while James opted for Ramesses III,>suggested earlier by Imannuel Velikovsky <. James has also written a controversial work on Atlantis, placing it in ancient Lydia (Turkey).>Complicating matters further is a related dispute as to whether the biblical Shishak is to be identified as the Egyptian pharoah Shoshenq or they should be treated as two separate people!(g)<