When did China start celebrating the New Year in beginning of spring?

The current "Lunar Calendar" in China is actually the "taichu calendar" used in the Han Dynasty, which is based on the accurate calculation of the earth's rotation. The New Year should be beginning of spring. At present, we follow the tradition that the first day of the first month is the New Year, which was stipulated in the form of a document in the second year of the Republic of China (19 12). That is to say, before 19 12, the Spring Festival in China began on the day of beginning of spring, while after 19 12, the Spring Festival began on the first day of the first month.

Later, the Gregorian calendar was mainly used in life, and the New Year generally refers to 1 day of the Gregorian calendar, that is, New Year's Day. The Lunar New Year is still the first day of the first month of the Spring Festival.

Since ancient times, every dynasty has set up a "moon". In the Xia Dynasty, the winter month was the first month, and the first month was the "sub" month, according to the method of recording the year by the main branch. The Shang Dynasty revised the new moon in January, and the Zhou Dynasty revised the new moon in January. Taichu calendar Law was established in the Han Dynasty. Although a new moon is still set up in each dynasty, the people do not change, and the first month is always regarded as the New Year, but the "sub" month remains at 1 1.