This will occur during the Tribulation. Following this, the Day of the LORD will occur upon the WORLD due to the rejection of the Gospel by earth-dwellers.
Enoch is the oldest prophecy we know of that deals with the end of the Tribulation and the Day of the LORD:
"And Enoch also, the seventh from Adam, prophesied of these, saying, Behold, the Lord cometh with ten thousands of his saints, to execute judgment upon all, and to convince all that are ungodly among them of all their ungodly deeds which they have ungodly committed, and of all their hard speeches which ungodly sinners have spoken against HIM." - Jude 1:14-15
I disagree with what you are saying. You have mentioned Enoch. I believe you should read Jude again. "And Enoch also, the seventh from Adam, prophesied of these, saying,"
You are talking about the end of the tribulation. You mentioned during the tribulation. What does the Bible say about the tribulation? When does the Bible say the tribulation would be? When is the tribulation? Or, when did it begin? Also, if it began before now are we in the tribulation now? I don't know what relationship the tribulation has to the day of the LORD. You are speaking of a phrase that occurs in scripture, the day of the LORD. Is this phrase always referring to the same thing? What does it refer to in each case? We should look at verses, the verses in scripture, that mention tribulation or the tribulation (is it right to say this?)? What do the scriptures say and what are they referring to?
Here are verses that have the word tribulation in them.
Matthew 24:9 NASB - "Then they will deliver you to tribulation, and will kill you, and you will be hated by all nations because of My name.
Matthew 24:21 NASB - "For then there will be a great tribulation, such as has not occurred since the beginning of the world until now, nor ever will.
Matthew 24:29 NASB - "But 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 the sky, and the powers of the heavens will be shaken.
Mark 13:19 NASB - "For those days will be a time of tribulation such as has not occurred since the beginning of the creation which God created until now, and never will.
Mark 13:24 NASB - "But in those days, after that tribulation, THE SUN WILL BE DARKENED AND THE MOON WILL NOT GIVE ITS LIGHT,
John 16:33 NASB - "These things I have spoken to you, so that in Me you may have peace. In the world you have tribulation, but take courage; I have overcome the world."
Romans 2:9 NASB - There will be tribulation and distress for every soul of man who does evil, of the Jew first and also of the Greek,
Romans 5:3 NASB - And not only this, but we also exult in our tribulations, knowing that tribulation brings about perseverance;
Romans 8:35 NASB - Who will separate us from the love of Christ? Will tribulation, or distress, or persecution, or famine, or nakedness, or peril, or sword?
Romans 12:12 NASB - rejoicing in hope, persevering in tribulation, devoted to prayer,
1 Thessalonians 1:6 NASB - You also became imitators of us and of the Lord, having received the word in much tribulation with the joy of the Holy Spirit,
Revelation 1:9 NASB - I, John, your brother and fellow partaker in the tribulation and kingdom and perseverance which are in Jesus, was on the island called Patmos because of the word of God and the testimony of Jesus.
Revelation 2:9 NASB - 'I know your tribulation and your poverty (but you are rich), and the blasphemy by those who say they are Jews and are not, but are a synagogue of Satan.
Revelation 2:10 NASB - 'Do not fear what you are about to suffer. Behold, the devil is about to cast some of you into prison, so that you will be tested, and you will have tribulation for ten days. Be faithful until death, and I will give you the crown of life.
Revelation 2:22 NASB - 'Behold, I will throw her on a bed of sickness, and those who commit adultery with her into great tribulation, unless they repent of her deeds.
Revelation 7:14 NASB - I said to him, "My lord, you know." And he said to me, "These are the ones who come out of the great tribulation, and they have washed their robes and made them white in the blood of the Lamb.