The twelfth lunar month, also called the twelfth lunar month, is the month of sacrifice. According to the historical records of China, "La" is the name of the festival at the end of a year, that is, the end month of a year. The ancients had the custom of offering sacrifices at the turn of the New Year, so the twelfth lunar month was also considered as the sacrificial month.

At the end of the year,1February is a month with more sacrifices, because it is in the transition period of the old and the new. As early as the pre-Qin period, it was convenient for some places in China to hold "year-end sacrifices" in this new and old alternate month. Because there are nicknames such as "twelfth month" and "winter" in December, the sacrifices held this month are called "La Worship".

In ancient times, there were many nicknames for the moon, and each nickname had a different meaning. In addition to the nickname "twelfth moon", there are other nicknames besides moon, late winter, late winter, Jiaping, Jidong and severe winter. The twelfth lunar month now usually refers to the twelfth lunar month.

December custom:

Now, the twelfth lunar month is usually called the twelfth lunar month. In northern China, the 23rd day of the twelfth lunar month is also called "off-year". Off-year is considered as the beginning of a busy year, which means that people begin to prepare new year's goods, sweep dust and offer sacrifices to stoves. And prepare for a clean and beautiful year, expressing people's good wishes to bid farewell to the old and welcome the new.

Due to different local customs, the days called "off-year" are different. Some places in modern China say that "three officials, three people, four boats and five boats" means that the official off-year is the 23rd of the twelfth lunar month, the people's family is the 24th of the twelfth lunar month, and the houseboat is the 25th of the twelfth lunar month.