Total nonsense. That verse is not referring to the length of the day of the Lord as you falsely imagine.
I think what you mean is that you are imagining that I have said anything about this verse having anything to do with the length of the Day of the Lord.
It just refers to the fact that no one knows the day or hour of His return (Matt 24:36, Matt 25:13). There's no particular times and seasons he could point to that would indicate the day or hour when Jesus was coming, so there was no reason for him to write to them about that because He is coming unexpectedly as a thief in the night, which Paul went on to describe in verses 2 and 3.
1 Thes 4 has to do with the rapture of the Church. Then Paul says there is no need that he write about the TIMES AND SEASONS and then his writing talks about the day of the Lord.
If he was talking about 1 Thes 4 being the day of the Lord he would have said.........but of the TIME AND SEASON.
Paul wrote about the day of the Lord here as well:
2 Thessalonians 1:7 And to you who are troubled rest with us, when the Lord Jesus shall be revealed from heaven with his mighty angels, 8 In flaming fire taking vengeance on them that know not God, and that obey not the gospel of our Lord Jesus Christ: 9 Who shall be punished with everlasting destruction from the presence of the Lord, and from the glory of his power; 10 When he shall come to be glorified in his saints, and to be admired in all them that believe (because our testimony among you was believed) in that day.
The only difference between this passage and 1 Thess 4:14-5:9 is that in this passage he first talks about what will happen to unbelievers on the day Jesus returns and then talks about what will happen to believers. In the 1 Thess passage he first talks about what will happen to believers on the day Jesus returns and then talks about what will happen to unbelievers on that day. If not for doctrinal bias, I don't believe anyone would try to say that 2 Thess 1:10 is not a reference to something that will occur when the rapture occurs. When else would He "come to be glorified in his saints, and to be admired in all them that believe" except for when He comes and gathers His people to Himself who are then forever with the Lord?
Again. If 1 Thes 4 was talking about the day of the Lord Paul would have said TIME AND SEASON.
In this passage, Paul also indicates that both the rapture and second coming are the same event:
2 Thessalonians 2:1 Now we beseech you, brethren, by the coming of our Lord Jesus Christ, and by our gathering together unto him, 2 That ye be not soon shaken in mind, or be troubled, neither by spirit, nor by word, nor by letter as from us, as that the day of Christ is at hand. 3 Let no man deceive you by any means: for that day shall not come, except there come a falling away first, and that man of sin be revealed, the son of perdition;
There is a coming of the Lord and a gathering together before the day of the Lord.............seen here.
Matthew 24
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:
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.
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.
This occurs at the 6th seal as marked by the signs of the sun, moon and stars.........seen here.
Revelation 6
12 And I beheld when he had opened the sixth seal, and, lo, there was a great earthquake;
and the sun became black as sackcloth of hair, and the moon became as blood;
13 And the stars of heaven fell unto the earth, even as a fig tree casteth her untimely figs, when she is shaken of a mighty wind.
Also seen here.
Revelation 14
14 And I looked, and behold a white cloud, and upon the cloud one sat like unto the Son of man, having on his head a golden crown, and in his hand a sharp sickle.
15 And another angel came out of the temple, crying with a loud voice to him that sat on the cloud, Thrust in thy sickle, and reap: for the time is come for thee to reap; for the harvest of the earth is ripe.
16 And he that sat on the cloud thrust in his sickle on the earth; and the earth was reaped.
17 And another angel came out of the temple which is in heaven, he also having a sharp sickle.
18 And another angel came out from the altar, which had power over fire; and cried with a loud cry to him that had the sharp sickle, saying, Thrust in thy sharp sickle, and gather the clusters of the vine of the earth; for her grapes are fully ripe.
19 And the angel thrust in his sickle into the earth, and gathered the vine of the earth, and cast it into the great winepress of the wrath of God.
And as we can see, the righteous are gathered to the clouds with Jesus and unrighteous remain on the earth for the wrath of God.
Pretribs try to separate "the coming of our Lord Jesus Christ" and "our gathering together unto him" as two completely separate events, but Paul repeatedly talked about them as the same event.
The coming of our Lord, the second coming, and our gathering together unto Him,
is the same coming. It occurs at the 6th seal prior to the Day of the Lord.
Revelation 6
16 And said to the mountains and rocks, Fall on us, and hide us from the face of him that sitteth on the throne, and from the wrath of the Lamb:
17 For the great day of his wrath is come; and who shall be able to stand?
Also seen here.
Revelation 14
19 And the angel thrust in his sickle into the earth, and gathered the vine of the earth, and cast it into the great winepress of the wrath of God.
And who is raptured?
Revelation 14
2 And I saw as it were a sea of glass mingled with fire: and them that had gotten the victory over the beast, and over his image, and over his mark, and over the number of his name, stand on the sea of glass, having the harps of God.
3
And they sing the song of Moses the servant of God, and the song of the Lamb, saying, Great and marvellous are thy works, Lord God Almighty; just and true are thy ways, thou King of saints.
It is the 12 tribes across the earth...........the seed of the woman that is raptured at the 6th seal. They are singing the song of Moses. That is why there are 144,000 first fruits from the 12 tribes. The is a rapture of the 12 tribes.
The Church is already in heaven..........Rev 5:9-10.
The woman, Israel, that has fled to a place of protection is in the place of protection.
Revelation 12
6 And the woman fled into the wilderness, where she hath a place prepared of God, that they should feed her there a thousand two hundred and threescore days.