4004 B.C.

In 1650 the Church of Ireland Archbishop of Armagh, James Ussher, (1581–1656) published a monumental history of the world from creation to 70 A.D. He used the recorded genealogies and ages in the bible to derive what is commonly known as the Ussher chronology. This calculated a date for Creation at 4004 BC. The date was widely accepted in the English-speaking world. http://en.wikipedia.org/wiki/History_of_creationism