Both Peter and Moses explain that with God 1000 years are like 1 day. This is a key that unlocks Jesus’ time keeping as recorded in the Gospels.
There are several "key" verses which explain Jesus’ own use of time and tell us that when scripture records Jesus doing anything over a period of time measured in days, that he is depicting time across intervals measured in thousands of years. The following is the New Testament quotation for this:
8But, my beloved, do not forget this 1 thing, that 1 day with master is as 1,000 years, and 1,000 years is as 1 day.
This passage is important and revealing. It is a new testament key to understanding God’s time. With God, each of His days are 1000 of our years long. Since Jesus was "God with us", his time based actions are depicting events which will transpire in their fullness over a period where 1000 of our years matches one of his days.
This ratio of 1 of God’s days equals 1000 of our years is an important clue with a bunch of immediate implications. Every year measured from Adam which ends in a "triple zero" is the last year of one of his days. Any year number ending in "001" is the first year of one of God’s days, again, when measured from Adam.
If we scan the history that we’ve already crawled through we see that there were several important events already on these types of years. The following are the big ones:
001 Adam’s first year, possibly his fall.
9000 Jacob’s Dream of a stairway to heaven.
10,000 Solomon’s Temple Dedication.
11,000 We have not looked at this, but we’ll find Jesus’ appearance in the Temple at age 12 hits here.
All the thousands from the time God started seriously redeeming mankind after Abraham are showing in this list. The flood, in 6020, is a close candidate too. The 20 years from 6000 may be showing us something else important.
Armed with this, we must ask about the year 12,000 from Adam and the year 13,000 from Adam. These years, and the years immediately there after, are also probably important, but how?
In all the prophetic end-times literature, which Peter is probably assuming his readers to know, the expression "Time, Times and half a Time" recurs with some frequence. The word "Times" is always taken to mean two times. The plural form of the word implying the definite plural form of just two, rather than an indefinite plural form like we use today in English meaning many.
Peter plays to this and is telling us that the "Last Days" are the last two days on God’s calendar, an echo of the definite two rather than the indefinite many. This shows amongst other things that this passage, like so many others dealing with the end of the age has contained within it a calendar clue as to when that end will be.
When is that? We cannot tell here if he means two of God’s days from the time of Peter’s writing, or two days from some future date, making the end of the "last days" be some other multiple of 1000 years into the future. We can only answer that question by looking elsewhere, but here we can assert that God’s dealing with mankind will end at the end of two of his days. Two days that essentially work alike.
At this point we can also assert that the year 12,000 from Adam probably did not have much important happen. Jesus did not come back, for example, so it would seem at this point that two of God’s days could very well be the two days 11,001 from Adam through 13,000 from Adam. Again, we need more proof, but at a certain level this should "feel" right.
There are those who at this point think that the "1000" years specified by Peter in this passage are indefinite in length. We turn our attention now to this issue.
Peter was not the first writer to claim that with God 1000 years are like a day. Peter was quoting Psalm 90. The following is the verse Peter was likely quoting.
4For 1,000 years in your sight are but as yesterday when it is past, and as a watch in the night.
This recounts the idea that one day on God’s time is 1000 of our years long. It also adds another detail. A "Watch in the night" is also 1000 of our years to him. As we’ll see Jesus uses this to tell us when he plans on returning. In this passage we also see the proper lengths of time which can be assigned to generations -- 70 or 80 years if strong. Which we will use to crack the meaning of the first chapter of Matthew.
These keys are what we need to start understanding time from God’s perspective. We turn our attention now to the first use these keys, the story of the Woman at the Well.