St Jeremiah wrote: You were in Eden, the garden of God; your heart became proud on account of your beauty, and you corrupted your wisdom because of your splendor. So I threw you to the earth; Ezekiel 28:13 & 17 We do not know how long after creation that Satan's pride lead to his fall. However...sometime passed because Genesis 3:8 "the LORD God as he was walking in the garden in the cool of the day" this means it was His habit for some time.
St Jeremiah, Very good answer. Our pastor at Cliffside Community Chapel has taken a lot of time in his sermons to explain this very thing. I have never heard anyone else teach this, but from all we can deduct from the Bible, what you have said is correct.
What really supprises me is all the people who think satan was created before time began. God is very clear in His word, that everything was created in those six days, so satan could not have been created before creation.