Just a point about Luke 21. In Luke’s version of the Olivet Discourse, specifically Luke 21:20–24, there are details that were entirely fulfilled in 70 A.D. the New Scofield Reference Bible says that as well.
And 25 to 28
25 “There will be signs in the sun, moon and stars. On the earth, nations will be in anguish and perplexity at the roaring and tossing of the sea. 26 People will faint from terror, apprehensive of what is coming on the world, for the heavenly bodies will be shaken. 27 At that time they will see the Son of Man coming in a cloud with power and great glory. 28 When these things begin to take place, stand up and lift up your heads, because your redemption is drawing near.”
Luke 21:5-36 deals with the answer to the question: WHEN WILL THE TEMPLE BE DESTROYED?
Luke 17:22-37 deals with the answer to the question WHAT WILL BE THE SIGN OF YOUR COMING AND OF THE CLOSE OF THE AGE?
I believe Luke 21.25-28 is clearly talking about the return of Christ - v. 27 makes this clear. I think Luke’s version of the Olivet discourse does a much better (or perhaps I should say clearer) job of distinguishing between the destruction of the Temple and the return Jesus than Matthew does. Throughout the Old Testament we also are warned that the end of times (or “day of the Lord”) will be accompanied by signs of the sun, moon and heavens. This seems to be a constant throughout prophecy. With regard to your question in your other post I have no idea what the Sons of Issachar is referring to. you’ll have to ask him about that. I am very much with you on the error of “date setters” and the practice of newspaper exegesis.