Well then, let me show you how we can deduce that Dan.9:27 has to do with the tribulation. When we cross-reference Dan.9:27 with Mt.24:15, where Jesus quotes Dan.9:27, he includes it as part of his answer to his disciples regarding the signs of tribulation that would lead up to his return to the earth and which ends the age.
"when will this happen, and what will be the sign of your coming and of the end of the age?”
Therefore, since Jesus included the setting up of the abomination as part of the signs leading up to his return and the end of the age. And we know that this event takes place in the middle of that seven year period, and he said that time would be a time of great distress such as the world has not seen from the beginning of creation, until now and never to be equaled again, then we know that the setting up of the abomination takes place at the beginning of the great tribulation period, which is that last 3 1/2 years prior to Christ's return. The setting of the abomination is also when that antichrist stands in the temple and proclaims himself to be God..
Therefore in response to your claim above, taking into consideration the information contained in Dan.9:27 and Jesus reference to the setting up of the abomination which begins that time of great distress, then we know that Dan.9:27 takes place during the tribulation period and is in fact the time of Jacob's trouble prophesied in Jer.30:7 and which is what Matthew 24 is describing leading up to the Lord's return to end that age.
Jesus clarifies what He meant in the Gospel of Luke as it is written:
Luk 21:20 And when ye shall see Jerusalem compassed with armies, then know that the desolation thereof is nigh.
Luk 21:21 Then let them which are in Judaea flee to the mountains; and let them which are in the midst of it depart out; and let not them that are in the countries enter thereinto.
Luk 21:22 For these be the days of vengeance, that all things which are written may be fulfilled.
this fulfills Daniel notice the similar language.
Mar 13:14 But when ye shall see the abomination of desolation, spoken of by Daniel the prophet, standing where it ought not, (let him that readeth understand,) then let them that be in Judaea flee to the mountains:
Mar 13:19 For in those days shall be affliction, such as was not from the beginning of the creation which God created unto this time, neither shall be.
and Matthew:
Mat 24:15 When ye therefore shall see the abomination of desolation, spoken of by Daniel the prophet, stand in the holy place, (whoso readeth, let him understand
Mat 24:16 Then let them which be in Judaea flee into the mountains:
So Jesus explains the symbol as Rome surrounding Jerusalem. This matches with Daniel as Jesus said:
Dan 9:26 And after threescore and two weeks shall Messiah be cut off, but not for himself: and the people of the prince that shall come shall destroy the city and the sanctuary; and the end thereof shall be with a flood, and unto the end of the war desolations are determined.
Dan 9:27 And he shall confirm the covenant with many for one week: and in the midst of the week he shall cause the sacrifice and the oblation to cease, and for the overspreading of abominations he shall make it desolate, even until the consummation, and that determined shall be poured upon the desolate.
So lets ask ourselves. Did Rome destroy the city and the temple some time after Jesus had died as He was the one who was cut off for our sins not for himself. Answer: Yes Rome did exactly as Jesus said and surrounded Jerusalem and eventually destroyed the city and the temple.
Already fulfilled.