Let’s get this out of the way. There is a great deal of argument on the Rapture and on the nature of the tribulation, even amongst the Christian sects that believe in them at all. And no, not every Christian sect believes in the Rapture, or in the tribulation. So if you’re trying to figure out an exact date of when the Rapture will happen, you’re not going to find it. Anyone who’s claiming they know is likely crazy, or trying to sell you something.
However, if you’re simply trying to find out more information about the Rapture, and what sort of signs to look for in order to guess at its coming? You’re still going to have a difficult time. There are a number of different scriptures in the Bible that point to a number of different things. For example, 1st Thessalonians 4 talks about the Lord descending from heaven with the sound of a great trumpet, allowing the people who had made Jesus their Lord to rise from death and come up to heaven. Romans 8 talks about allowing our mortal bodies to be made forever alive. But none of these verses do anything other than speak in metaphors.
You’ll notice, it gives no indication of an exact time, or even a general time. And that’s even presuming the Bible supports the idea of a rapture at all. There are many arguments that the Bible supports no such thing, and merely discusses the coming of Jesus in terms of metaphor.
You’ll also have many church leaders attempting to proclaim the Rapture will happen “soon”, based on the Bible’s descriptions of the End Times. However, many of the things listed are things that have always been. 1st Timothy 3 talks about people being wicked and lovers of money, but people have always been wicked and lovers of money. There’s even a verse that states that people will claim “all these things have always been true”, which makes it difficult to have a genuine discussion about the end of days with people who really want to claim we live in them!
Ultimately, the answer to “when will the Rapture happen” is “that was left intentionally vague”. This is because Jesus didn’t want us to focus on a future time of perfection, but rather, making things as perfect as they can be while we’re here on Earth.