It's not invented in 1830.
Hermas tells us that he passed by a wild beast and met a virgin who saluted him saying, Hail O man.! He returned the greeting... Lady, hail! Then she asked... Has nothing crossed your path? Hermas replied... I was met by a beast of such a size that it could destroy peoples, but through the power of the Lord and His great mercy, I escaped from it... The virgin said... Well, did you escape from it, because you cast your care on God, and opened your heart to the Lord, believing that you can be saved by no other than His great and glorious name? You have escaped from great tribulation on account of your faith, and because you did not doubt in the presence of such a beast. God therefore, and tell the elect of the Lord His mighty deeds, and say to them that this beast is a type of the great tribulation that is coming. If ye prepare yourselves, and repent with all your heart, and turn to the Lord, it will be possible for you to escape it, if your heart be free and spotless in serving the Lord blamelessly."
Hermas, The Shepherd of Hermas,
Book I, fourth, ch. ii, also ch. iii)
This shows that the teaching was definitely in the early church of a pre-trib rapture, and that the teaching of the pre-trib rapture was not added in 1830, but to a restoration of the doctrine that had been lost when the church apostatized in the dark ages.
Revelation 3:10 (KJV)
10 Because thou hast kept the word of my patience, I also will keep thee from the hour of temptation, which shall come upon all the world, to try them that dwell upon the earth.
The word "hour’ designates a time of coming trial, a period of tribulation that comes upon not only a part of the earth, but upon ‘all who dwell upon the earth."
The word for ‘dwell’ is not the normal "oikeo" but the strengthened "katoikeo" meaning all who are identified with the earth. Alford refers us to other examples in the Bible of this word being used, which shows it refers to "those who are not of the church of Christ".
Why would we be constantly exhorted to watch, if we could date the Antichrist’s coming, note esp. the date of the abomination of desolation, for if we were here, and knew that date, we have revealed in Scripture to the day, how many days after that is the second coming, and we would know the day of His return
https://www.armyofprophets.com/post...e-of-the-1830s-7899551?highlight=rapture+1830
This is from Murjahel, a preacher who used to post on cf.