There are several important things for you to know. While yes, I
have mentioned this before, we need to be reminded of this:
I have been watching for Jesus return for  fifty years. We all hoped
that Jesus return would be ten years ago, (three score and ten years
after 1948,)  but that was not in God's plan. I believe the reason for
the randomness in the timing of the rapture, and then His second
coming, is the faithful church's faithlessness in witnessing to the
lost. The rapture cannot happen until the last of Jesus' sheep accepts
Him as saviour! This is not a random number. God knows who all of his
sheep are.
   2520 ... Israel was chastized 2520 Hebrew years after the return
from Babylon/ Persia, until 1948 because of Ezekiel 4:4-6 and
Leviticus 26:27-28.  Likewise, the tribulation is 2520 days long.
   Daniel ch 12 says the Abomination will be 1290 days after the
sacrifices are stopped in mid trib. This will happen on the 9th of
ave. Jesus return to Petra is 45 days later on Daniel 12s  1335th day.
His coming to Jerusalem from the East is several days later , so He
can Tabernacle with His people in Jerusalem. See Zechariah ch 14.
   So, we know the timing of the end of the tribulation period. What
we don't know is the year, and how many days between the rapture and
the start of the >>shortened<< 2520 day tribulation period,  which
begins with  the "Covenant with many." And yes, I think the Covenant
with Many is about setting up the ten region world government, and not
necessarily about Israel.
   Please also note that the future AC is "only one of many" setting
up Daniel' 9s "covenant with many." He does not get world wide
authority until 3 1/2 years later.

Maranatha,  Lewis B