“Abomination of desolation” originally referred to the desecration of the temple by Greek tyrant Antiochus Epiphanes (175 B.C.), who set up a shrine to Zeus in the Holy Place and sacrificed a pig there. Daniel 11.
A second“abomination” will happen at the end of this age (Daniel 12).
Israel will undergo unprecedented trouble (Daniel 12:1a),
But its suffering will end with a great divine deliverance (12:1b),
There will be resurrections (Daniel 12:2).
The number of days following will be 1,290 days (Daniel 12:11), which includes the 1,260 days of Revelation, plus 30. No idea why the 30 extra, we can only speculate.
Matthew 24:15 probably is not referring to Rome’s attack in 70 A.D. because:
In 70 A.D., the Christians left before the Romans entered. In contrast, Christ says that the disciples would see the abomination standing in the holy place, and then flee.
Daniel said Jerusalem’s destruction by Rome would precede the desolating abomination (Daniel 9:26, 27).
Suffering believers vulnerable to deception.
Christ tells them to ignore all claims that He has returned. (23-26)
His return will be public, visible, universal, unmistakable (27-28).
You want to know where Christ is? Look for vultures. Matt. 24:28, Rev. 19:17-21.