What day is New Year's Day, please?

Yuantan is a traditional Chinese holiday, the Yuan is the "beginning", the beginning of the number called "Yuan"; Dan is the "day". Yuan Dan, meaning "initial day". It first appeared in the "Book of Jin": "Zhuan Di to the first month of Meng Xia for the yuan, in fact, the first day of the spring." That is, the first month is called Yuan, the first day of the year for Dan.

Yuan Dan in different times, the specific time referred to is not the same. In the Xia Dynasty period of the Xia calendar in the spring of January for the first month; the Shang Dynasty period of the Yin calendar in winter December for the first month, the Zhou period of the Zhou calendar in winter November for the first month; the Qin Dynasty period, and the winter of October for the first month, the first day of October for the New Year's Day, the Han Emperor Wu Di period, the provisions of the spring of January for the first month, the first day of January known as the first day of the New Year's Day, and has been in use until the end of the Qing Dynasty.