THE GREAT TRIBULATION HAS TWO SEPARATE AND DISTINCT PHASES........

The first phase is the SHORTENED phase which BEGINS only upon Israel BEFORE the resurrection / rapture of "HIS ELECT" Body of Christ Church. The SECOND phase is the  full-length phase which BEGINS upon the whole world "IMMEDIATELY AFTER the resurrection  / rapture of His Body of Christ Church. The "shortened" first phase of the Great Tribulation  judgment UPON ISRAEL ONLY  is the Gog-Magog War. 

THE "SHORTENED" FIRST PHASE :

The shortened first phase of the Great Tribulation begins upon Israel only  BEFORE the resurrection / rapture , and is "shortened" by Jesus Himself in order to save the flesh on earth of "THE ELECT" woman remnant of Jews who survive the shortened first phase of the great tribulation upon Israel only according to :

Matthew 24:21-22

"For then there shall  be great tribulation  ,,,,,,,,And except those days should BE SHORTENED there should no ( Jewish ) flesh be saved, but for the elect's ( the woman  remnant of Jews ) sake those days should be shortened. "

Mark 13:19-20

"For in those days shall be tribulation, ,,,,,,And except that the Lord had SHORTENED those days  no ( Jewish ) flesh should be saved,  but for the elect's ( the woman remnant of Jews ) sake whom He has chosen He has shortened the days."

Romans 9:27-28

"......Though the number of the children of Israel be as the sand of the sea , A REMNANT SHALL BE SAVED; For He will FINISH THE WORK ( the first phase of the  great tribulation upon Israel only ) , and CUT IT SHORT in righteousness because a SHORT WORK will the Lord make upon the earth."

Revelation  12:6

"And the woman fled into the wilderness where she has a place prepared by God that they should feed her there 1,260 days."

Revelation 12:17

"And the dragon was wroth with the woman,  and went to make war with THE REMNANT of her seed which keep the commandments of God , and have the testimony of Jesus Christ."

SO, THERE YOU HAVE IT :

The resurrection / rapture of His Body of Christ Church will occur "IMMEDIATELY AFTER"  Jesus "FINISHES THE WORK"  of the shortened first phase of the Great Tribulation upon Israel only according to : 

Matthew 24:29

"IMMEDIATELY AFTER the ( shortened ) TRIBULATION OF THOSE DAYS ( those days of the Gog-Magog War upon Israel )..........."  The resurrection / rapture then happens according to : Matthew 24: 30-31. AFTER the resurrection /rapture occurs the Great Tribulation then comes upon  the WHOLE WORLD.

According to Your Holy Word , come Lord Jesus !