When did the Spring Festival come?

The Spring Festival, which originated in ancient times, is the most solemn and lively traditional festival in China. In Xia, Shang and Zhou Dynasties, the Spring Festival was called "the first year" and "the year", and the concept of "the year" came from the ancient calendar and was expressed by "the year of emperor". The date of the Spring Festival has also been changed many times. During the period of Emperor Wu of the Han Dynasty, the first day of the first month was designated as "Year" and the custom of the Spring Festival was established.