When is the first day of the twelfth lunar month?

La Worship is a large-scale sacrificial ceremony held at the end of the year to bid farewell to the old and welcome the new. As early as the pre-Qin period, people had La Worship behavior; Therefore, people call the La Worship Moon the twelfth lunar month, and it has been used ever since. In this month, people are busy preparing for La Worship Sacrifice and completing La Worship activities, and are also busy bidding farewell to the old year and welcoming the new year. Because the twelfth lunar month is the last month of the lunar year, after the twelfth lunar month, the Lunar New Year will be ushered in; There is also a folk saying that "the winter moon is the new year, and the twelfth month is the new year"; Therefore, since the first day of the twelfth lunar month, people have been busy with festivals related to China New Year.