The Book of Jubilees by R.H. Charles

The Book of Jubilees, probably written in the 2nd century B.C.E., is an account of the Biblical history of the world from creation to Moses. It is divided into periods of 49 years. For the most part the narrative follows the familiar account in Genesis, but with some additional details such as the names of Adam and Eve's daughters, and an active role for a demonic entity called 'Mastema'. The anonymous author had a preoccupation with calendar reform, and uses Jubilees as a platform for proposing a solar calendar of 364 days and 12 months