> In China, the seven day week was adopted in the late 4th Century A.D. in the Jin dynasty I think this needs a citation. I've never seen any mention of 7-day

> In China, the seven day week was adopted in the late 4th Century A.D. in the Jin dynasty I think this needs a citation. I've never seen any mention of 7-day weeks in historical Chinese texts. Systems of 7-day weeks might be known by Chinese by this time due to cultural and religious exchanges with the West, but claims that it was "adopted" is news to me. My impression is that the current 7 day week system adopted in China is a very recent phenomenon, i.e. presumably not earlier than the 19th century, and mostly due to the work of Christian missionaries. (... I could be wrong though, I haven't read that much post-Jin texts...)