This sounds like a good research project on mid-1800s religious groups is in order. Many of these "The end is nigh" groups started in the mid 1800s, and the Jehovah's Witlesses is one of them. They were effectively the answer to a heated dispute as to when the end was coming, and they emphatically picked 1874 as their answer. That was in 1872, after quite a few of them had already went bust. Unlike some of the others that died out, the witlesses dishonestly adjusted their date when they started going bust as well--first to 1878, then 1914, and then the dates we are more familiar with. You will learn that, if the end didn't come in 1874 and they continued adjusting the date, that it probably will not come now (at least not a supernatural end).
The reality is that there are possibilities. The end could come--as in a manmade totalitarian government ending all freedom, man exterminating life from the earth, or something slamming into the earth. If that happens, no cult or religion is going to help you--and it is impossible to predict with certainty when this will happen. It could happen tomorrow, or it could happen 5 billion years from now when the sun swallows the earth. And, a man-made end could be stalled because of free will--they could change their minds or run into unforseen circumstances preventing them from executing their plans.
The other possibility is that the end will not come at all--at least not until the sun swallows the earth 5 billion years from now. There will always be disasters and man-made political problems, but nothing that will with finality end things on earth. Again, no religious group is going to help.
The possibility of a God-initiated end, however, can safely be dismissed forever. God has been promising this ever since humans were capable of thinking for themselves. Jesus was misquoted as promising that the end of all civilization was imminent, when it was only the Jewish system that was going down. Religions have promised deliverance within a time frame of a lifetime ever since they began, and nothing has happened. Usually, the religions themselves created more havoc than any judgment, and they solved precisely nothing. Even God Himself has created more problems and solved nothing--how many people need to prove their integrity before He is satisfied? And, wasn't Jesus supposed to be "a perfect sacrifice, to which nothing ever need be added"? If so, why are we still waiting 2,000+ years later? Because it's all a scam?