The Day Jesus Returns is referred to as the great Day of God Almighty. Revelation 16:13b
The Great and terrible Day of the Lord's vengeance and fiery wrath, the Sixth Seal world changer, is at least 10 years before that.
The idea of conflating the two Days of the Lord yet to come, is quite wrong and is refuted by Zechariah 14:3-4, Matthew 24:29-30 and Revelation 19:11-2
There is no fiery punishment then, Malachi 4:1 & 3, or any earthquakes, etc, when Jesus Returns in His Glory.
Matthew 25:1 gives the account of Jesus’ wedding supper, and in verse 13 let’s us know that His wedding includes His second coming.
That establishes that His return includes the wedding supper.
Revelation 19:6 is also about the wedding supper, followed immediately by His return in verse 11, wherein He judges and makes war and He does this:
Rev 19:15 And out of his mouth goeth a sharp sword, that with it he should smite the nations: and he shall rule them with a rod of iron: and he treadeth the winepress of the fierceness and wrath of Almighty God.
He uses the sword from the above verse:
Rev 19:21 And the remnant were slain with the sword of him that sat upon the horse, which swordproceeded out of his mouth: and all the fowls were filled with their flesh.
Thus at His second coming, He makes war, and brings a sword, God’s fierceness and wrath, and smites the nations.
In 2Thessalonians 1:7-10. Under the chapter titled ‘The Judgment at Christ's Coming’ Jesus returns with flaming fire, and takes vengeance on evil doers.
This establishes that flaming fire is also connected with His second coming.
In the next chapter - unless you believe Paul jumps topics - he equates the day of the Lord with the second coming of Jesus, in 2Thessalonians 2:1-2.
The Day of the Lord comes in Zechariah 14:1-2 as Jerusalem is being attacked and destroyed by armies of many nations - and Jesus returns in verses 3-5 and ends up destroying those armies.
Zec 14:1 Behold, the day of the LORD cometh, and thy spoil shall be divided in the midst of thee.
In Isaiah 13:6 the Day of the Lord comes with destruction from the almighty...
with wrath and fierce anger, destroying sinners vs. 9...
and punishes the world for evil and the wicked for their sins vs. 11...
Jesus does the same things at His second coming that occur in the Day of the Lord, and Zechariah 14 and 2Thessalonians 2 unequivocally put the second coming of Jesus, and the Day of the Lord together.
And just before the second coming and gathering together of the elect in Matthew 24, the sun turns dark and the moon turns black, which occurs on the day of the Lord.
Mat 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:
Mat 24:30 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.
Mat 24:31 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
I’d say that scripture establishes very well that the day of the lord and the second coming of Jesus are synonymous.
Shalom.
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