<P> However, Niels - Erik Andreasen, Jeffrey H. Tigay and others claimed that the sabbath is mentioned as a day of rest in some of the earliest layers of the Pentateuch dated to the 9th century BC at the latest, centuries before Judea's Babylonian exile . They also find the resemblance between the biblical Sabbath and the Babylonian system to be weak . Therefore, they suggested that the seven - day week may reflect an independent Israelite tradition . Tigay writes: </P> <P> It is clear that among neighboring nations that were in position to have an influence over Israel - and in fact which did influence it in various matters - there is no precise parallel to the Israelite Sabbatical week . This leads to the conclusion that the Sabbatical week, which is as unique to Israel as the Sabbath from which it flows, is an independent Israelite creation . </P> <P> The seven - day week seems to have been adopted, at different stages, by the Persian Empire, in Hellenistic astrology, and (via Greek transmission) in Gupta India and Tang China . </P> <P> The Babylonian system was received by the Greeks in the 4th century BC (notably via Eudoxus of Cnidus). However the designation of the seven days of the week to the seven planets is an innovation introduced in the time of Augustus . The astrological concept of planetary hours is rather an original innovation of Hellenistic astrology, probably first conceived in the 2nd century BC . </P>

When did we start using the days of the week
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