>>18083565
>We have no idea, at all, how long the timescale of the Bible is until we start to nail things down towards the end of the Old Testament.
In Ezekiel 4:5, it says that God commanded the prophet Ezekiel to lie on one side for 390 days, one day per year since the time that Israel began to sin. If you count the years of the kings in Jerusalem, you get almost exactly that amount of time as well. Both the Ezekiel prophecy and a manual count of the years of kings of the southern kingdom places Solomon's reign at approximately 1015-975 BC, give or take two-three years. This puts Solomon's fourth year in c. 1012 BC, and in 1 Kings 6:1 it says his fourth year was the 480th year since Israel came out of Egypt into Canaan. So we get the Exodus happening 40 more years before that, around 1530-1533 BC. And if Israel spent exactly 430 years in Egypt (see Exodus 12:40; long chronology) then the year Jacob entered Egypt is also known within a few years. In Genesis 47:9, it says he was one hundred and thirty years old, which is the last link we need.
From there, the Bible reader can back-date through the patriarchs fairly accurately (although there's some uncertainty added because we are not told exactly how many months and days old they were, only their age in years). The flood then occurred in 2601-2618 BC, and Adam's creation in 4257-4283 BC if we take the age numbers given at face value.
So, the Bible is pretty clear about the timeframe since the creation of mankind and the six days of creation (literal days, see Exodus 20:11).
However, there is no indication of how much time passed between Genesis 1:1 and Genesis 1:2. We can only speculate as to why it says that the earth was without form and void, flooded with water and ruined to an extent such that God had to reconstruct it. We know that God creates all things new and whole, so there must have been some kind of judgement to befall the cosmos after Genesis 1:1 and before Genesis 1:2. Maybe because of Lucifer.