Dear Mathman,
Do not take this as a challenge to your work. But one that may add a depth to it.
I began my quest for dates in 2010...significant.
The first timeline I came upon was from Daniel 12:11. Now to understand my timelines, you must take into account the following description of what a generation is. As found in Psalm 90:10
 
9 For all our days pass away under your wrath;
    we bring our years to an end like a sigh.
10 The years of our life are seventy,
    or even by reason of strength eighty;
yet their span[c] is but toil and trouble;
    they are soon gone, and we fly away.
11 Who considers the power of your anger,
    and your wrath according to the fear of you?
 
Now in my time studying time lines, I came up with 14 different ones that all pointed to the year 2026/2027....some of them so specific that I was counting days from certain events found in a scripture passage. (An example would be Ezekial 40:1, Tish. 10, 573 bc)
 
As Israel became a nation in 1947 (by decree), this eighty years would be in 2027.
 
Without getting into the specifics here and now, what I believe we may have here is a ten year window...or door to use a biblical analogy. 2017-2027, based on an eighty year count from 1947.
 
 Interestingly the word used translated "strength" in the KJV, but as "span" in the ESV (Highlighted in yellow) is the word "ROHAB" which means "  arrogance, pride, object of pride", The Masculine noun of "RAHAB" meaning "  to behave proudly, act stormily or boisterously or arrogantly". Pride, thus is the resistance to the events panning out in seventy years or eighty.
 
Again, This is not to be hostile towards your work, but I believe a compliment to it. As Ron Reese has pointed out, 2009, 2020, 2026, and 2027 are all years of perfect order. 2020-2027 are the only ones that relate in a 7 year time period.
 
God bless.
David H.