Interpreting the date God created the Earth by reading and interpreting the Bible is very difficult. You can put dates on events, time between events, etc. then convert it to the modern Julian calendar. One popular interpretation is Sunday, October 23, 4004 BCE. Generating this date, and similar, rely on the Ussher chronology technique. The Ussher chronology technique comes from the 17th-century Archbishop James Ussher. Ussher created a chronology of the history of the world formulated from a literal reading of the Old Testament. Updates and various interpretations along the same lines are frequently lumped under Ussher chronology.
4004 BCE, The Bible’s Earth Creation Date
240 Generations Ago