In terms of time, Chinese New Year's Eve is connected with the Spring Festival, but it has its origin, that is, "chasing the epidemic and driving away ghosts". The Han portrait stone has both a "puppet picture", and the Song Dynasty painted a "big puppet picture" is a proof.
In addition to the original meaning of "transaction" and "removal", "xi" has the meaning of "night", and this day is generally on the thirtieth day of the lunar month, commonly known as "Chinese New Year's Eve". It is the night when people "stay awake all night", commonly known as "keeping the year".
Therefore, starting from its original meaning, its meaning can be to "abandon the old and welcome the new" and "drive away evil and avoid filth" on the last night of the year. Therefore, the Spring Festival and Chinese New Year's Eve have both similarities and certain differences, and the former can also include the latter to some extent - the folk saying "after Laba is the year", and "year" is called "Spring Festival" in modern and contemporary society.
In addition, people go to relatives' homes at different times since the beginning of the new year to pay New Year's greetings to different relatives, such as "returning to their parents' home" in the second year of junior high school and "aunts and aunts" in the third year of junior high school.
Chinese folk often refer to Chinese New Year's Eve as "Chinese New Year's Eve", the day is "Great Division", and the night is called "Chinese New Year's Eve". In some areas, the day before Chinese New Year's Eve is also called "Little Chinese New Year's Eve".
From the perspective of classics, the appearance of "Chinese New Year's Eve" may be much later than the Spring Festival. The earliest surviving document mentioning "Chinese New Year's Eve" is the "Wind and Soil Record" written by the Western Jin Dynasty Zhou, "until Chinese New Year's Eve, Dadan never sleeps, which is called keeping the year".
Chinese New Year's Eve is mostly on the 30th day of the lunar month, but there are also 29th lunar months. The traditional Chinese calendar is generally a lunisolar calendar, considering both the movement of the sun and the moon, and at the same time observing the seven stars of the Big Dipper, the twenty-eight Nakshatras, etc., but in order to bridge the time difference between the sun, moon and stars, a common year and a leap year were formulated.
Therefore, the last month of the lunar year has both 30 days and 29 days, but 30 days is the most.