1. 1 There was no abomination of desolation in 70 AD
It was
in AD 66 when the armies showed up to surround Jerusalem - just as Luke 21:20 described what the "abomination of desolation" actually was. Many heeded Christ's warning when they saw this "abomination of desolation" in AD 66, and fled from Judea and Jerusalem for the mountains as Christ had told them to do.
2. There was no great tribulation at or near that time like has never been seen before or after (again WW1 and WW2 made 70 AD look like a picni
It was not the number of casualties from this AD 66-70 period that composed an unprecedented tribulation that would never be repeated in history to follow. It was the fact that the entire Satanic realm was imprisoned within the city of Jerusalem during those years, just as predicted by Isaiah 24:21-23 and Revelation 18:2. Jerusalem became a "habitation of devils, and a prison for every unclean spirit."
No city or nation had ever before or ever would in the future experience having the entire Satanic realm of evil coming to plague them as happened in Jerusalem in those AD 66-70 years. Christ had predicted this would happen in Matthew 12:43-45 for that wicked generation to experience in its "last state".
3. Nothing in 70 AD would have even come close to ending all life on earth cause ing the return of Jesus
You are mistakenly presuming that Matt. 24:22 is speaking about the entire globe. Christ was not speaking of the death of all mankind world-wide. In that Matthew 24 context, Christ was particularly concentrating on
the land of Israel and what would happen to that nation and Jerusalem. The prediction for that nation of Israel during
"the siege both against Judah and against Jerusalem" (Zech. 12-14) was that "
in all the land", (the land of Israel) two-thirds of them would be cut off and die, but that one third would be refined by the "fire" of God's judgment (Zech. 13:8-9). This one-third remnant would call on God's name and God would own this remnant as being His people. God shortened that great tribulation period in Israel to lasting only 3-1/2 years so that this elect remnant in Zechariah 13:9 could survive that great tribulation period by escaping to the mountains to wait out the war.
4. Jesus did not return there was no sign in heaven/
The "sign in heaven" which pointed to the date of Christ's return was
the new moon's appearance in the sky. The priests in Israel would carefully watch for the first sign of the new moon in heaven, because this was what determined the festival date of the Passover, and consequently the day of Pentecost 50 days later.
Daniel 12:11-13 had predicted the exact day in which the resurrection of Daniel 12:1-2 would occur, which was to be at the end of those 1,335 days. That end of the 1,335th-day countdown fell on Pentecost day in AD 70 - the day in which Christ bodily returned to the Mount of Olives, just as Zech. 14:4-5 predicted He would do.
Even back in the post-exilic return with the temple rebuilt under Zerubbabel, the people were to worship by facing the eastern gate in the Sabbaths and the new moons. Only the Prince was to enter and leave by this eastern gate, and it was to be kept shut except for the Sabbaths and the new moons. All of that was symbolism foretelling the location and the timing of Christ's second coming return - to the Mount of Olives directly opposite this eastern gate with the Kidron Valley between.
