IIPeter 3:5 For this they willingly are ignorant of,
that by the word of God the heavens were of OLD, and the earth standing out of the water and in the water: (Genesis 1:2)
6 Whereby the world that then *was*, being overflowed with water, perished:
7 But the heavens and the earth which are *now*, by the same word are kept in store, reserved unto fire against the day of judgment and perdition of ungodly men.
Indeed, 2 Peter chapters 2 and 3 are speaking both to what has happened and what shall happen.
And as those verses suggest, we look back in Scripture to understand prophecy about things that have not yet come to pass. And in this case, we can look to The Fall to reveal the first insight that a 1,000 days to Adamic man is equal to a day to God.
And all the days that Adam lived were nine hundred and thirty years: and he died. - Genesis 5:5
God's Name is I AM.