I'm not aware of us being told the exact time these events occurred.
That's odd since you say all those things have already come to pass, but you can't prove it. It pretty much discredits a person when they can not prove their point as it only shows one's own speculations. Jesus was very clear when all these things will come to pass. Maybe not exact dates, but by the signs He has already given beginning with the sorrows right up to the time of His return.
Matthew 24 are the predictions Jesus gave to His disciples on the Mount of Olives as He answered there three questions, Tell us, when shall these things be? and what
shall be the sign of thy coming, and of the end of the world?
The first thing Jesus told the disciples that sat with Him that the Temple would be destroyed, which happened in 70 A.D. Then Jesus told them to take heed that no man deceive you for many shall come in my name saying I am Christ and shall deceive many. This continues even more today then it did in the times of the disciples after Jesus was taken up to Heaven in a cloud.
From vs. 3-31 Jesus answers the "what " portion of their question as these are the beginning of sorrows that this and every generation there after would see in their lifetimes. These verses teach every generation about the tribulation to come and the second coming of Christ.
From vs. 32-51 Jesus answers the "when" portion of their questions about His second coming and the signs to watch for before He returns and gives them a parable of the fig tree and the illustrations of the days of Noah and the two servants.
"This generation" means starting with the generation from the time of the disciples after Jesus was take up to heaven to the last generation that will see God's great wrath being poured out into the world during the seven trumpets sounding and immediately after the tribulation of those days shall the sun be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken. And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory. And he shall send his angels with a great sound of a trumpet, and they shall gather together his elect from the four winds, from one end of heaven to the other.