We are told no man can name the day it will occur, however we are given signs and events to look for and know it is near. There are many of these signs now by the way.
First, there will be what is called the rapture. People everywhere will vanish. Support for this is in Acts when Philip is transported hundreds of miles in the blink of an eye.
Those left will be sinners and Israel. The latter due to they being special in God’s eyes. Many left will be those that thought themselves to be Christian. Several of these will realize theirs error and fix themselves with God. It will be at a horrific cost though. Those in power will insist upon a chip being implanted and a mark placed upon those that remain upon the planet. Those that have made themselves right with God will refuse and be beheaded. We now know, due to recent events, how these beheadings will be done.
This will last three and a half years until the last to truly accept God dies. What will be left are those that deny and hate God, and also Israel.
Then Enoch and Elijah will return to earth as witnesses against those upon the entire earth at this time. They will try to kill them repeatedly but fail. This will last for nearly the next three and a half years, when they finally succeed in killing the two witnesses.
At this time, Israel will finally have the scales fall from their eyes and call Jesus the true Messiah and as they do Jesus will answer their cries and return to the earth with those that were called in the rapture behind Him. Those that denied God will mostly be killed.
Then Jesus will make His home in Jerusalem for a thousand years. While those from the rapture will join Christ and co-govern and become priests unto those left upon the earth in this millennium. Then once again, Satan will be loosened upon the world to tell his lies and see who will falter and fall.
When it is done, the Great White Throne Judgment will transpire. At this time any not taken in the rapture must stand before God. This will cover all that ever lived upon the earth if they knew God or not. They will be judged upon all their actions throughout their lives. What is important to understand, that it will be easier upon those that never heard of God, but if you know of God even if you deny He is real, it will be hardest upon you.
For you were given an opportunity to accept God, but you turned your back upon Him and so He will do the same for you upon that day. Those taken in the rapture were given an immortal body the moment they were called into heaven. When the White Throne Judgment takes place as you are risen from the dead to stand before the throne, you too will be given an immortal body. For we are all promised an eternal body.
What is different though is where you will spend the coming eternity. I will leave it to you to find out which you would rather live for the billions of years to come.