Methods of calculating calendars were known in China as early as the Xia (c. 21st-17th C. BC) and Shang (c. 17th-11th C. BC) dynasties, and today's Chinese lunar calendar is also known as the Xia calendar.
在曆法方面，中國在夏商時期已有曆法，今天的農曆，也稱「夏曆」。