2 Peter 3:19-12 day of the Lord is a part of the whole cross reference of the return of Christ being the last day after the seven trumpets of Gods great wrath is finished. This is the time Christ comes to destroy the beast and the false prophet casting them into the lake of fire. Then comes the catching up of the saints. Those who are still alive at His coming and those who sleep in the grave as He sends His angels out to the four corners of the earth to gather His own to Him in the air. Before we are caught up to meet Him in the air this corruptible shall have put on incorruption, and this mortal shall have put on immortality, then shall be brought to pass the saying that is written, Death is swallowed up in victory. It is only those who have rejected Christ, both alive and in their graves at His coming that are raised to damnation. There is only one resurrection that takes place on the day Christ returns, but two different judgements.
Matthew 24:29-31; John 5:28, 29; 6:40; 1 Corinthians 15:51-55; 1 Thessalonians 4:13-18; Rev 19:11-21.
The Lord's day being the day of the Lord is a day of Gods great wrath being poured out on those who refuse to repent. It is always pointed out as the day at hand meaning in Gods timing in Rev 1:10. The phrase the day of the Lord” is used nineteen times in the Old Testament (Isaiah 2:12; 13:6, 9; Ezekiel 13:5, 30:3; Joel 1:15, 2:1,11,31; 3:14; Amos 5:18,20; Obadiah 15; Zephaniah 1:7,14; Zechariah 14:1; Malachi. 4:5) and five times in the New Testament (Acts 2:20; 1 Thessalonians 5:2; 2 Thessalonians 2:2; 2 Peter 3:10; Rev 1:10). It is also alluded to in other passages (Revelation 6:17; 16:14).
The Lord's day only appears once in scripture in Rev 1:10. It gives no reference to what day of the week it was as every day is the Lord's day, but more specific is also referred to the Sabbath day in Mark 16:9; Acts 2:42; 20:7; 1Corinthians 16:1,2 . John was in the Spirit, but yet in his physical body when he received from the angel all these revelations that he wrote down. Throughout scripture the Lord's day is usually referred to as the Sabbath being the seventh day of the week, Genesis 2:1-3 a day of rest.
I believe the Day of the Lord is the millennium in Rev.1:10.
Let's take a look at Rev.1:10, it speaks of a trumpet.
Plus, before that, Rev.1:6,7 hath made us kings and priests unto God...
Every eye shall see Him even those that pierced Him and all kindred of the earth..
Sounds like the Lord's day to me.
The day of the Lord, the Lord's day..
Also regarding souls,
Yes, us mortal souls must put on immortality, but some are still mortal souls.
As Rev.20:5,6
But the rest of the dead ( spiritually) lived not again until the 1000 years are finished.
Meaning
They have mortal souls (liable to die).
Those who took part in the first resurrection took on immortality.
The second death hath no power over these.
Thus,there must be a second death or resurrection when the mortal souls put on immortality.
Why is Satan loosed again after the millennium?
Who is he going to deceive?
Those who have mortal souls.
Resurrection not only means coming out of the grave, literally.
Resurrection of the spiritually dead.
As the vision of dry bones in Ezek.37:4
Prophesy to them, hear the word of the Lord.
They were spiritually dead.
Like dead man walking.
There is a lot of people today, walking, that are spiritually dead.