Here is something interesting.  I believe that we will have the start of the tribulation period and 1260 days later we will have the death of the two witnesses. Calculate 3.5 days while they lie in the street. this is followed by the last 1260 days of the Great Tribulation.  If we take the date of Jan. 1, 2007 and add 2523 days, it falls on Nov. 28, 2013 (or the first day of Hanukkah)