The Daniel 9 2300 days have not yet been fulfilled.
Dan 8:9-14
9 And out of one of them came forth a little horn, which waxed exceeding great, toward the south, and toward the east, and toward the pleasant land.
10 And it waxed great, even to the host of heaven; and it cast down some of the host and of the stars to the ground, and stamped upon them.
11 Yea, he magnified himself even to the prince of the host, and by him the daily sacrifice was taken away, and the place of his sanctuary was cast down.
12 And an host was given him against the daily sacrifice by reason of transgression, and it cast down the truth to the ground; and it practised, and prospered.
That "little horn" represents the "vile person" of Daniel 11 about his making a "league" and becoming strong with a "small people" (small group of traitors, leaders in Jerusalem at the end that support that final Antichrist - Dan.11:23). It's the "vile person" of Daniel 11 that we are told will end sacrifices and place the "abomination that maketh desolate" (Daniel 11:31). That is the "transgression" being spoken of.
13 Then I heard one saint speaking, and another saint said unto that certain saint which spake, How long shall be the vision concerning the daily sacrifice, and the transgression of desolation, to give both the sanctuary and the host to be trodden under foot?
That question is asking how long from the time of those daily sacrifices to that AOD and the temple and Jews in Jerusalem being trodden under foot (by the Gentiles per the Revelation 11 Scripture).
Thus the subject is how long from...
1. the daily sacrifice (to be setup sometime prior... to the "abomination of desolation" event.
2. and the AOD event
3. and the trodding down of Jerusalem by the Gentiles.
14 And he said unto me, Unto two thousand and three hundred days; then shall the sanctuary be cleansed.
KJV
If you believe the "abomination of desolation" Jesus proclaimed was not the historical event by Antiochus Epiphanes, then it means you agree it is for the very end of this world, like Jesus showed in Matthew 24 per the Signs of the end He gave there.
If you believe the 42 months the Gentiles are given to tread the sanctuary per Revelation 11 is about a final temple yet to be built in Jerusalem, that means the only way their treading will end is by the event of Lord Jesus' 2nd coming on the last day of this world. Only then... will the sanctuary be cleansed (actually Jesus, THE BRANCH, building His future temple at His return per Zechariah).
That means to place the END of that 2300 day period on the day of Jesus' future return on the "last day".
So count backwards from that last day, and we arrive at...
[..............1260.....................]AOD[...............1260..................]CHRIST'S COMING
...............................[.....................2300 days......................]
[..............1260.....................]AOD[...............1260..................]
[..............1040........][..220...]AOD[...............1260..................]
Most likely that 1040 days will be the first period within the first 1260 half, with the building of a new temple in Jerusalem by the Jews. The 220 day period would begin the sacrifices again, and the AOD would be the middle of the week when Antichrist will end those sacrifices and place the abomination idol in that new temple.