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In page Chinese calendar:

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The seven-day week was adopted from the Hellenistic system by the 4th century CE[citation needed], although its method of transmission into China is unclear. It was again transmitted to China in the 8th century by Manichaeans via Kangju, spoken in a variant of Sogdian language (a Central Asian kingdom near Samarkand),[1][a][b]. Its meaning is derived from the five classical planets, along with the Sun and Moon, making a total of seven celestial bodies highly visible in the sky, in Chinese translation 七曜. At that time, people created simple handwritten almanacs, where Sunday was marked with the character 密.[2] The seven-day week had fallen out of favour for a long time, only to be revived when Christianity gained a foothold in China and later made mandatory by the government.