What does the old imperial calendar mean?

1. The old imperial calendar used to be called "calendar day", "constitutional book" and "general book". It arranges the year, month and day according to a certain calendar, and provides books about taboos. It has a history of 1000 years in China. In the feudal imperial era, because it was promulgated by the emperor, people also called it "imperial calendar".

2. What is recorded in the Imperial Calendar is mainly the calendar of that year. After this year, the new calendar will be replaced. However, since calendars are all given by the emperor, it is obvious that old calendars should be carefully preserved. Therefore, everyone called the old calendar "old" and called it "old imperial calendar".

The "old imperial calendar" is not suitable for the New Year. Therefore, "old imperial calendar" gradually evolved into a derogatory term to refer to conservative thoughts and behaviors.