When did the tradition of Spring Festival in China begin?

The Spring Festival, also known as Yuanri, New Year's Day, the Reform Movement of 1898, Chen Yuan, Yuanshuo, Nian Egg, Sui Nian, Nianchao, Xinzheng, Shouzuo, Sanyuan or Nian and New Year, is the first day of the summer calendar. Due to the different calendars, the first day of the first month of each generation is different: the first day of the first month of Xia Dynasty, the first day of December of Shang Dynasty, the first day of November of Zhou Dynasty, the first day of October of Qin Dynasty and the first day of the first month of Han Dynasty, which have continued to this day.

It can be seen that the Spring Festival has already existed in summer. ......