A process of elimination is employed here towards discovering the Bible's placement of the "thousand years" Millennium within the Last Day timeline. This seemed appropriate when it was found that there were more than a few theories among believers throughout the 20 centuries of Christianity concerning the "thousand years" Millennium.  Upon inspection it became clear that these theories were made of differing combinations of certain fundamental errors. Click each Millennial theory to reveal the errors below:

Revelation 20:1-8
1 And I saw an angel coming down from heaven, having the key of the abyss and a great chain in his hand. 2 And he laid hold of the dragon, the serpent of old, who is the devil and Satan, and bound him for a THOUSAND YEARS, 3 and threw him into the abyss, and shut it and sealed it over him, so that he should not deceive the nations any longer, until the THOUSAND YEARS were completed; after these things he must be released for a short time.4 And I saw thrones, and they sat upon them, and judgment was given to them. And I saw the souls of those who had been beheaded because of the testimony of Jesus and because of the word of God, and those who had not worshiped the beast or his image, and had not received the mark upon their forehead and upon their hand; and they came to life and reigned with Christ for a THOUSAND YEARS. 5 (The rest of the dead did not come to life until the THOUSAND YEARS were completed). This is the first resurrection. 6 Blesssed and holy is the one who has a part in the first resurrection; over these the second death has no power, but they will be priests of God and of Christ and will reign with Him for a THOUSAND YEARS.7 And when the THOUSAND YEARS are completed, Satan will be released from his prison, 8 and will come out ...

2 Peter 3:8-10
But do not let this one fact escape your notice, beloved, that with the Lord one DAY is as a THOUSAND YEARS, and a THOUSAND YEARS as one DAY. 9 The Lord is not slow about His promise, as some count slowness, but is patient toward you, not wishing for any to perish but for all to come to repentance. 10 But the DAY of the Lord will come ...

Psalms 90:4
For a THOUSAND YEARS in Thy sight are like yesterDAY when it passes by, or as a watch in the NIGHT.

Romans 13:11-12
And this do, knowing the time, that it is already the hour for you to awaken from sleep; for now salvation is nearer to us than when we believed. 12 The NIGHT is almost gone, and the DAY is at hand.
Related Scriptures: 30-70AD: the Night was almost gone, and the Day was at hand