(2 Peter 3:10) - Peter writes to his audience presumably the same audience that was written to in his first letter, to his fellow Jewish brothers, and some Gentiles (depending on what may be said), whom were in the Kingdom areas of Pontus, Galatia, Capadocia, Asia, and Bithynia, who were elect according to the foreknowledge of the Father.
Now, with this many people mark this as the sign and time for today that people are looking for which comes like a thief. What is this day? Peter is writing about the day of the LORD, have you ever heard that before?
What is taught normally is that - on the day of the LORD that comes like a thief, in which the heavens will pass away with a roar and the elements will be destroyed with intense heat, and the earth and its works will be burned up.
First one thing needs to be addressed here - what is the heavens and the earth which would pass away proclaimed by Jesus? Heaven and earth will pass away, but my words will never pass away. (Matthew 24:35). What should be known about this is that the Jewish brothers of Jesus, looked at their land as their heaven and earth, why? Because God before the death of Christ and resurrection, had chosen a nation, and gave them a land. This land was there heaven and earth. They also had the temple, the temple was were they went to sacrifice and even God would show up in this temple which was on Mount Mariah. You can find this information in (1 Kings 8:11).
For the Jewish people their heavens and earth (land), was theirs, and Jesus claims it would pass away, and so does peter, and how would this come about? With intense heat, and the elements (everything around would) become destroyed? There heaven and earth would pass away it would be no more the age would be over.
How? By the invading armies of Rome which Jesus also proclaimed, (Luke 21:20-24), and this would be the Day of the Lord, which Peter had stated, would come upon the unbelievers at the time like a thief in the night! They would be literally bombarded with God's wrath which ( I suspect ) God used the Roman Armies to take the nation then out, and destroy everything bringing forth a new age which is of the Spirit.
What in the world is Peter talking about? Did he even know what he was talking about as an Apostle of Christ? Of course, for a fisherman, he remembered what he was taught in the old testament, let's go back and look at the very last book of the bible they would have had in their day.