Pay attention to the context.
"This is now the second letter that I am writing to you, beloved. In both of them I am stirring up your sincere mind by way of reminder, that you should remember the predictions of the holy prophets and the commandment of the Lord and Savior through your apostles, knowing this first of all, that scoffers will come in the last days with scoffing, following their own sinful desires. They will say, “Where is the promise of his coming? For ever since the fathers fell asleep, all things are continuing as they were from the beginning of creation.” For they deliberately overlook this fact, that the heavens existed long ago, and the earth was formed out of water and through water by the word of God, and that by means of these the world that then existed was deluged with water and perished. But by the same word the heavens and earth that now exist are stored up for fire, being kept until the day of judgment and destruction of the ungodly.
But do not overlook this one fact, beloved, that with the Lord one day is as a thousand years, and a thousand years as one day. The Lord is not slow to fulfill his promise as some count slowness, but is patient toward you, not wishing that any should perish, but that all should reach repentance. But the day of the Lord will come like a thief, and then the heavens will pass away with a roar, and the heavenly bodies will be burned up and dissolved, and the earth and the works that are done on it will be exposed.
Since all these things are thus to be dissolved, what sort of people ought you to be in lives of holiness and godliness, waiting for and hastening the coming of the day of God, because of which the heavens will be set on fire and dissolved, and the heavenly bodies will melt as they burn! But according to his promise we are waiting for new heavens and a new earth in which righteousness dwells."
Peter is addressing his readers concerning those “scoffers” who are making fun of the Christian hope that Jesus will return. Peter reminds his readers that God’s way of doing things, His way of reckoning timing, isn’t at all how humans do it.
Why does Peter bring up how a day is as a thousand years or a thousand years is as a day? Because of this: “The Lord is not slow to fulfill His promise as some count slowness, but is patient toward you”
God isn’t slow, He’s doing things His way. Don’t be concerned with time, God will keep His word–the same word that He created all things, and that same word which declares that–in the end–all things will reach their end. In the here and now, trust in what God has promised.
Seeing as these things are true, Peter asks, “What sort of people ought you to be?” To live lives of holiness and godliness, waiting and hastening the coming day of God. Be faithful.
That’s why Peter brings it up.
I’m not a Chiliast. I don’t interpret the Revelation literally. I interpret the Revelation according to its historic and literary context.
When 2033 comes and goes, and what you predict has not come to pass. The question will be for you what it has been for everyone who has made a prediction before you: Will you repent, or will you “do the math again”?
Are you familiar with William Miller? Harold Camping? Hal Lindsay? Perhaps you should learn from their mistakes, and not repeat them.