World Ends in 2013, according to Newton (via Flynn)

From the excerpt I just read, it would appear that the entire premise of "Temple at the Center of Time: Newton's Bible Codex Deciphered and the Year 2012," by David Flynn, revolves around the following:

Because of how the prophet Daniel divided the prophetic week in half, Flynn believes the original founding date for the empire of the prophecy, Rome, would follow this pattern and be bisected. Therefore, correcting Newton's date, the year 753 B.C. designates the founding of the physical Rome while A.D. 753 establishes the rebirth of spiritual Rome. Counting 1,260 years forward from A.D. 753, one arrives at the year 2013.

Since when does halving something mean a mirror image of dates, from BC to AD?

And, typically of such books that like to use numbers, 2013 is "near enough" to 2012.