Many have taken upon themselves to try to figure out when our tribulation which has been going on since 70 AD will end. Most can't even accept or recognize when Israel's tribulation began, let alone when it will end. First we will figure out when said tribulation even began... Israel was made desolate in 70 , and there are certain desolations that were determined on the desolate until the time of the end.
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.
Now I know many will think to argue the tribulation Israel went through ended with the wrapping up of 70 AD when Rome destroyed Israel, but it didn't end there. Notice how even after Israel fled, Satan continued to make war with the remnant of her seed who keep the commandments of God and have the the testimony of the messiah.
During this tribulation, Israel from time to time has been helped by the "earth" which I believe are the peoples of the earth...since the time the Romans were allowed to make Israel desolate, because of Israel's abominations committed against Yah. The earth swallowed up the flood.
33 And they that understand among the people shall instruct many: yet they shall fall by the sword, and by flame, by captivity, and by spoil, many days. 34 Now when they shall fall, they shall be holpen with a little help: but many shall cleave to them with flatteries. 35 And some of them of understanding shall fall, to try them, and to purge, and to make them white, even to the TIME OF THE END: because it is yet for a time appointed.
In 70 AD, many Israelites fled into their place of refuge from the Roman soldiers.
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.
What does Consummation mean?
noun: consummation; plural noun: consummations
the action of making a marriage or relationship complete by having sexual intercourse.
"the eager consummation that follows a long and passionate seduction"
the point at which something is complete or finalized.
Obviously the consummation spoken of in the scriptures found in Daniel is not speaking of literal sex, but a completion of covenant, or redeemed purchase.
This will be completed when Messiah returns. Remember when he said, "I go to prepare a place for you, that where I am you will be also? As A husbandman who will be married to New Jerusalem who descends from heaven, also called the bride, those who are his will enter into that holy city and dwell there.
Receipt or proof of consummation/redemption/completed transaction
And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption.
And ye shall be hated of all men for my name’s sake: but he that shall endure unto the end, the same shall be saved.
All of that having been said, There have been countless failed prophecies, and mathematical guesses on when the messiah will return. Some have calculated a 400 year prophecy and taught our captivity would end in 2019 based on the notion that Israel didn't spend 400 years in Egyptian bondage. After that prophecy didn't seem to pan out, others continued modifying the prophecy for later dates and more speculations, as if those Israelites living a little over two thousand years ago couldn't do math, or figure out how long their ancestors served in bondage. When messiah said no man knows, he didn't say that because the people were stupid, he said it because it was simply the truth!
Let's see what the scripture says will happen at the end of tribulation and what will be the unmistakable sign of of his coming
29 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: 30 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.
9 And when he had opened the fifth seal, I saw under the altar the souls of them that were slain for the word of God, and for the testimony which they held: 10 and they cried with a loud voice, saying, How long, O Lord, holy and true, dost thou not judge and avenge our blood on them that dwell on the earth? 11 And white robes were given unto every one of them; and it was said unto them, that they should rest yet for a little season, until their fellowservants also and their brethren, that should be killed as they were, should be fulfilled.
12 And I beheld when he had opened the sixth seal, and, lo, there was a great earthquake; and the sun became black as sackcloth of hair, and the moon became as blood; 13 and the stars of heaven fell unto the earth, even as a fig tree casteth her untimely figs, when she is shaken of a mighty wind. 14 And the heaven departed as a scroll when it is rolled together; and every mountain and island were moved out of their places. 15 And the kings of the earth, and the great men, and the rich men, and the chief captains, and the mighty men, and every bondman, and every free man, hid themselves in the dens and in the rocks of the mountains; 16 and said to the mountains and rocks, Fall on us, and hide us from the face of him that sitteth on the throne, and from the wrath of the Lamb: 17 for the great day of his wrath is come; and who shall be able to stand?
So there, we see scripture says immediately after the tribulation, the moon will not give it's light, the sun will be darkened, and the stars will fall from the sky, also men will see the son of man coming in the clouds.
Messiah already stated no man knows the day or hour, but only the father who is in heaven. People need to stop assuming they know more than the angels, or even the messiah himself knows. We need to stick to scripture lest you be driven by every wind of doctrine that comes along.