The phrase "7 year tribulation" was created, popularized, back in the 1970's as the so-called pre-trib rapture view was being promoted heavily. There is no such thing as the "7 year tribulation". What they are referring to is the 70th week of Daniel 9.
But in reality, not all of it will be "tribulation". In fact, most of the first half of the 7 years will be a false messianic age, with the world saying peace and safety (noted on my chart also).
Pre-trib view believes that the rapture "must" happen before the 70th week begins. How far ahead of the 70th week, no-one knows. Maybe a day, maybe a week, maybe months, maybe years.
The Anytime rapture view of my chart - allows for the possibilty that the rapture could happen before the 70th week begins - just as pre-trib believes. But the Anytime rapture view does not maintain that it "must" happen before the 70 week begins.
The limiting factor of when the rapture must happen before in the Anytime rapture view is that it "must" happen before the transgression of desolation act by the Antichrist.
Easy way to understand the two views...
Pre-trib - rapture must happen before the 70th week starts.
Anytime - rapture must happen before the transgression of desolation act by the Antichrist
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What begins what...
The 70th week - begins when prince who shall come, following Gog/Magog, is perceived by the Jews as the messiah. He has the law read from the temple mount to the nation of Israel, following a requirement Moses made of all future leaders of Israel, back in Deuteronomy 31:9-13 - on a 7 year cycle.
It will not be a 7 year peace treaty between Israel and her neighbors as often as has been taught - mainly coming from the pre-trib camp.
The beginning of the Day of Lord - begins when the Antichrist, about 3 years into the 70th week, unexpectedly goes into the temple, sits, claims to have achieved God-hood. That act is
the transgression of desolation (not
the abomination of desolation) - Daniel 8:12-13 is where you will find the term.
The beginning of the Great Tribulation - begins when the image (a statue) of the person after he has become the beast is placed on temple mount. The statue image is
the abomination of desolation. It's placement will take place 1335 days before the day Jesus Returns, to stand on the Mt. of Olives. Daniel 12:12.
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Here is the path of the person - most commonly known as the Antichrist - on his way to his destruction into the lake of fire...
the little horn > becomes the prince who shall come > becomes the Antichrist
( and the 70th week begins) > becomes the revealed man of sin ( and the Day of the Lord begins) > becomes the beast ( and great tribulation begins) > cast alive into the lake of fire.
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Here is a chart I made that has most of the information on it. Just follow the stair-stepped red line down through the chart from upper left corner to lower right corner.
View attachment 328066