And the day of the Lord is a future event, as I previously posted.
The Lord will have compassion on Jacob; once again he will choose Israel and will settle them in their own land. Foreigners will join them and unite with the descendants of Jacob. Nations will take them and bring them to their own place. And Israel will take possession of the nations and make them male and female servants in the Lord’s land. They will make captives of their captors and rule over their oppressors.On the day the Lord gives you relief from your suffering and turmoil and from the harsh labor forced on you, you will take up this taunt against the king of Babylon: How the oppressor has come to an end! How his furyhas ended! The Lord has broken the rod of the wicked, the scepter of the rulers, which in anger struck down peoples with unceasing blows, and in fury subdued nations with relentless aggression. All the lands are at rest and at peace; they break into singing.Even the junipers and the cedars of Lebanon gloat over you and say, "Now that you have been laid low, no one comes to cut us down.” The realm of the dead below is all astir to meet you at your coming; it rouses the spirits of the departed to greet you—all those who were leaders in the world; it makes them rise from their thrones—all those who were kings over the nations. They will all respond, they will say to you, “You also have become weak, as we are; you have become like us.” All your pomp has been brought down to the grave, along with the noise of your harps; maggots are spread out beneath you and worms cover you.How you have fallen from heaven, morning star, son of the dawn! You have been cast down to the earth, you who once laid low the nations![Isaiah 14:1-12]
Every whit of this is about Lucifer, the morning star, the king of Babylon. In vss 13,14, the king gloated about his own greatness, and expressed it with figurative language.
The day of the Lord is a future event, as evidenced by...
I always thank my God for you because of his grace given you in Christ Jesus. For in him you have been enriched in every way—with all kinds of speech and with all knowledge—God thus confirming our testimony about Christ among you. Therefore you do not lack any spiritual gift as you eagerly wait for our Lord Jesus Christ to be revealed. He will also keep you firm to the end, so that you will be blameless on the day of our Lord Jesus Christ.[1 Cor. 1:4-8]
It is actually reported that there is sexual immorality among you, and of a kind that even pagans do not tolerate: A man is sleeping with his father’s wife. And you are proud! Shouldn’t you rather have gone into mourning and have put out of your fellowship the man who has been doing this? For my part, even though I am not physically present, I am with you in spirit. As one who is present with you in this way, I have already passed judgment in the name of our Lord Jesus on the one who has been doing this. So when you are assembled and I am with you in spirit, and the power of our Lord Jesus is present, hand this man over to Satan for the destruction of the flesh, so that his spirit may be saved on the day of the Lord.[1 Cor. 5:1-5]
Then there's 2 Peter 3:10, 1 Thess. 5:2, 2 Thess. 1:1-4. The day of the Lord is a future event and not in Isaiah 14:13,14.