Soon after the Two Witnesses are resurrected into heaven (the
2nd Woe), the 7th angel blows the 7th trumpet which is the last to
be sounded (see 1 Corinthians 15:52). Those who died 'begotten' and
those living begotten who remained strong to the end, will be
transformed in spiritual children of God and meet their descending
Lord Jesus in the sky above.
Revelation 11:15-19New King James Version (NKJV)
Seventh Trumpet: The Kingdom Proclaimed15 Then the seventh angel sounded: And there were loud voices in heaven, saying, “The kingdoms of this world have become the kingdoms of our Lord and of His Christ, and He shall reign forever and ever!” 16 And the twenty-four elders who sat before God on their thrones fell on their faces and worshiped God, 17 saying:“We give You thanks, O Lord God Almighty,
The One who is and who was and who is to come,
Because You have taken Your great power and reigned.
18 The nations were angry, and Your wrath has come,
And the time of the dead, that they should be judged,
And that You should reward Your servants the prophets and the saints,
And those who fear Your name, small and great,
And should destroy those who destroy the earth.”
19 Then the temple of God was opened in heaven, and the ark of His covenant was seen in His temple. And there were lightnings, noises, thunderings, an earthquake, and great hail.
The Second Coming is defined by Wikipedia as: In Christianity, the Second Coming is the anticipated return of Jesus from Heaven to earth, an event to fulfill aspects of Messianic prophecy, such as the general resurrection of the dead, the last judgment of the dead and the living and the full establishment of the Kingdom of God on earth (also called the "Reign of God"), including the Messianic Age. Views about the nature of this return vary among Christian denominations. The original Greek of the New Testament uses the term parousia (παρουσία), the "appearance and subsequent presence with" (in the ancient world referring to official visits by royalty). The Second Coming is also referred to as the Second Advent, from the Latin term "adventus", for "coming".
When the disciples asked Christ this same question, He specifically said no-one knows when except God the Father:-
Mat 24:3-5, 23-24,27, 29-31, 36:- And as he sat upon the mount of Olives, the disciples came unto him privately, saying, Tell us, when shall these things be? ...(v.4) And Jesus answered and said unto them, Take heed that no man deceive you. (v.5) For many shall come in my name, saying, I am Christ; and shall deceive many. (v.23) Then if any man shall say unto you, Lo, here is Christ, or there; believe it not. (v.24) For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if it were possible, they shall deceive the very elect. (v.27) For as the lightning cometh out of the east, and shineth even unto the west; so shall also the coming of the Son of man be. (v.29) Immediately after the tribulation of those days shall the sun be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken: (v.30) And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory. (v.31) And he shall send his angels with a great sound of a trumpet, and they shall gather together his elect from the four winds, from one end of heaven to the other. (v.36) But of that day and hour knoweth no man, no, not the angels of heaven, but my Father only.
In Appendix D, Warnings and Cautions of "Thy Kingdom Come, Thy Will Be Done", the authors Lambert Dolphin and Ron Graff said:-
Several cautions are in order for those who wish to know the truth but do not want to not be misled by false teachers. Here are some of these warnings and cautions: 1 - We cannot know the date of Christ's return. Jesus said, No one knows about that day or hour, not even the angels in heaven, nor the Son, but only the Father. (Matthew 24:36) He also said: Therefore keep watch, because you do not know on what day your Lord will come. But understand this: If the owner of the house had known at what time of night the thief was coming, he would have kept watch and would not have let his house be broken into. So you also must be ready, because the Son of Man will come at an hour when you do not expect him. (Matthew 24:42-44) It should be noted that the previous two paragraphs relate to Christ's Glorious Return, not the Rapture. But if it is true for that later event, how much more would it be true for the Rapture, for which no specific signs are given.
In answer to their question about when He would establish His Kingdom, Jesus answered, "It is not for you to know the times or dates the Father has set by his own authority." Acts 1:7
In another place, where Jesus' disciples wrongly thought that the Kingdom was going to appear at once, He gave them a parable about ten stewards, each of whom received money to invest. They were told to "Occupy until I come." (Luke 19:13 KJV) We do not know when He will return, but we should be busy about His business until that glorious day..... These cautions, and many others, have been expressed in two good recent books: Soothsayers Of The Second Advent, by William M. Alnor, and 99 Reasons Why No One Knows When Christ Will Return, by B.J. Oropeza. Both of these men are associated with the Christian Research Institute in Irvine, California, founded by the late Dr. Walter R. Martin. Hank Hanegraaff, president of that organization, who is now known as "The Bible Answer Man," around the world, is an voice for caution. In the foreword to Oropeza's book he reminds us that 1 Peter 1:13 tells us to be sober-minded and alert. He suggests that we be prepared for Christ's coming at any time, but realize it may not happen for another thousand years. (B.J. Oropeza, 99 Reasons Why No One Knows When Christ Will Return, p. 9)
In the Old Testament, Daniel prophesied that the Messiah would descend with the clouds of heaven. When Jesus came to the world, He did not descend with the clouds. He came physically through an ordinary woman, Mary. However, as soon as Jesus was baptized, heaven opened and the Spirit of God descended on him. The prophecy was fulfilled by the descend of the Holy Spirit from heaven and not His physical body descending from heaven.
When Jesus Christ ascended to heaven, the Apostles were told "This same Jesus, who has been taken from you into heaven, will come back in the same way you have seen him go into heaven. Jesus has returned very shortly after, i.e. during Pentecost. He came back in the form of Holy Spirit descending from heaven, not physically descending from heaven.
If Jesus has returned, why did the Apostles still talk about His coming in their Epistles as well as in the Revelations? The coming of the Lord, the coming of Christ and similar expressions refer primarily to the judgment of God on all man. This judgment happens in the life time of all man. James wrote in his Epistle that the Lord's coming is near, the Judge is standing at the door! (James 5:8-9) If this is referring to a physical coming at the end of the world, it could not be described as near, and certainly not at the door. It is at the door of every man because it will happen in their life time.
Many people miss what Jesus said in Mark 13:28-29 where He says ..."Now learn a parable of the fig tree; When her branch is yet tender, and putteth forth leaves, ye know that summer is near: So ye in like manner, when ye shall see these things come to pass, know that it is nigh, even at the doors."
Although Jesus said that no one knows the day or hour of His second coming. We CAN know when it is NEAR, from the signs of the end times. Is it "near" now? Yes. As we are the first generation to fulfil ALL the Biblical signs that are given in the Bible. And the reason Jesus gave us signs is that we could prepare and watch and be ready for His return.
No one know for sure when, but it will be called the rapture. Thousands around the world will just simply disapear.
Some religions use the term Rapture, I much prefer Millennium. To say that thousands will just disappear is somewhat harsh on those who remain behind. Those who remain on earth will have been forewarned where the (Millions) will be so it will come as no shock to them, for they will be the most wicked of all Gods children.
Paul believed that Jesus would return in his own lifetime and taught his followers to be ready for Jesus' return. When the Thessalonians expressed concern for their friends who had already died while waiting, he gave them an assurance that the dead would be caught up in the air along with those then still living (1 Thessalonians 4:15): "For this we say unto you by the word of the Lord, that we which are alive and remainunto the coming of the Lord shall not prevent them which are asleep." Of course, this event did not happen during Paul's lifetime nor the lifetimes of those to whom he made this promise.
Next came Mark's Gospel, influenced by Paul's epistles. Mark chapter 13 talks of the return of Jesus, again within present lifetimes. The accurate description of the First Roman-Jewish War and of the civil war that raged within Jerusalem at the time of the Roman siege, were portrayed as heralding this event in the very near future. Once again, Jesus did not return, and the later gospels altered Mark's passage to have a somewhat different meaning focussed on the indeterminate future.
Over the centuries since, and into the twenty-first century, there have hundreds of prophecies of Jesus' imminent return. None has proved true. We can confidently say that Jesus will not return during our lifetimes or the lifetimes of our grandchildren. In fact Jesus is unlikely ever to return - this is simply a biblical legend.