In regards to Dan 12:11-12 and the 1290 and 1355 days we need to consider context and how Jesus made reference to Daniel:
(Dan 12:1 “At that time Michael shall stand up, The great prince who stands watch over the sons of your people; And there shall be a time of trouble, Such as never was since there was a nation, Even to that time. And at that time your people shall be delivered, Every one who is found written in the book. )
Jesus addresses Dan 12:1 "be a time of trouble, such as never was since there was a nation" in Matt 24:21:
(“For then there will be great tribulation, such as has not been since the beginning of the world until this time, no, nor ever shall be.)
In the previous verse he stated:
(Mat 24:15 “Therefore when you see the ‘abomination of desolation,’ spoken of by Daniel the prophet, standing in the holy place” (whoever reads, let him understand )
Regardless of how Dan 12:11-12 are understood Jesus placed his comments from Daniel in the generation that heard him as we have testimony from Luke that the siege of Jerusalem was the focus of the events and parallel statements to Matthew.
Unless Matthew and Luke are speaking of different generational events then the abomination of desolation and "a time of trouble, such as never was since there was a nation" occurred during the time of the encampment and destruction of the temple and Jerusalem.
(Luke 21:20 “But when you see Jerusalem surrounded by armies, then know that its desolation is near.)
(Luke 21:21 Then let those who are in Judea flee to the mountains, let those who are in the midst of her depart, and let not those who are in the country enter her. ")
(Mat 24:15 “Therefore when you see the ‘abomination of desolation,’ spoken of by Daniel the prophet, standing in the holy place” (whoever reads, let him understand )
(Mat 24:16 “then let those who are in Judea flee to the mountains.)
All three synoptic gospels claim:
"Assuredly, I say to you, this generation will by no means pass away till all these things take place."