Dear Blue,
I use the Chronology study of one Frank Klasson who wrote a small book titled "The Chronology of the Bible" which is now out of print. It is the best source that I have found as it is totally complete through the time of Jesus. Klassen was an engineer - an Architect as I recall. In the 70's he drew out graphically bible timelines on his drafting board. Most all of these were taken from the Bible itself. He basically worked backward in time since history is well documented beginning about the time of Alexander the Great.
According to Klassen's research - Adam was created on Friday April 1st (Who says that God doesn't have a sense of humor) in the year 3975BC. Jesus was born on April 1st 5BC. Jesus was baptised around Oct 1st 25AD almost exactly 4,000 years after the creation of Adam. So to today time, since the creation of Adam, is 5984 years. So we have 16 years yet to the 6,000 year mark. Ussher is close by a few years. So it looks like 2025 is the year 6,000.
His work is available on the net among the used booksellers. He also has a "Klassen Calendarized Study Bible" which is still around. I found one for only $8.00 (KJV) - but I was lucky on that one.
Some think that the Adam and Eve story is just a myth. However there exists a geneology of Adam part of which is in Matthew. Some people claim that they can trace their ancestry back to Adam. Consider Athiesm, which claims to be "scientific" - no such geneology exists for anyone. How much more scientific can you get than having a list of chronological names of generations.
Larry