Here's what the Bible actually says about the rapture and when it happens:
15For this we declare to you by a word from the Lord, that we who are alive, who are left until the coming of the Lord, will not precede those who have fallen asleep. 16For the Lord himself will descend from heaven with a cry of command, with the voice of an archangel, and with the sound of the trumpet of God. And the dead in Christ will rise first. 17Then we who are alive, who are left, will be caught up together with them in the clouds to meet the Lord in the air, and so we will always be with the Lord.
1 Thessalonians 4:15-17
1. The return of Christ, the trumpet sounds
2. The resurrection of the dead
3. The rapture
29“Immediately after the tribulation of those days the sun will be darkened, and the moon will not give its light, and the stars will fall from heaven, and the powers of the heavens will be shaken. 30Then will appear in heaven the sign of the Son of Man,
and then all the tribes of the earth will mourn, and they will see the Son of Man coming on the clouds of heaven with power and great glory. 31And he will send out his angels with a loud trumpet call, and they will gather his elect from the four winds, from one end of heaven to the other.
Matthew 24:29-31
1. After the tribulation
2. The return of Christ, the trumpet sounds
3. The rapture
52 in a moment, in the twinkling of an eye, at the last trumpet. For the trumpet will sound, and the dead will be raised imperishable, and we shall be changed.
1 Corinthians 15:52
1. The last trumpet sounds
2. The resurrection of the dead
3. We shall be changed
4. All in the twinkling of an eye
15 Then the seventh angel blew his trumpet
, and there were loud voices in heaven, saying, “The kingdom of the world has become the kingdom of our Lord and of his Christ, and he shall reign forever and ever.”
Revelation 11:15
1. Final trumpet, Christ reigns forever
2. Kingdom of the world becomes the Lord's kingdom
The resurrection seen is on (The Last Day) as Jesus Christ taught, John 6:39-40, & 11:23-24
In conclusion: after the great tribulation Christ returns at the last (seventh and final) trumpet, the dead are resurrected, and believers are changed and raptured, all in the twinkling of an eye. They aren't separate events, they happen together.