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In page Young Earth creationism:

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The most accepted and popular date of creation among young Earth creationists is 4004 BC because this date appears in the Ussher chronology.[citation needed] This chronology was included in many Bibles from 1701 onwards, including the authorized King James Version.[6] The youngest ever recorded creation date in historic Jewish or Christian traditions is 3616 BC, by Yom-Tov Lipmann-Muhlhausen.[7] Some proponents of young Earth creationism propose dates several thousands of years earlier, by theorizing significant gaps in genealogies in chapters 5 and 11 of the Book of Genesis, e.g. 6984 BC by Alfonso X of Castile,[8] Harold Camping with 11,013 BC, and Christian Charles Josias Bunsen in the 19th century suggesting 20,000 BC.[9]