International public calendar, namely Gregorian calendar. It takes a tropical year as a year and then divides it into twelve months (the number of months is 3 1 day, 30 days and 29 days, all of which are manually designated), which is called "solar calendar", that is, "solar calendar". It was ordered by westerners, and people in Hong Kong and Taiwan also called it "Western Calendar" and "Western Yuan".

Our country has kept the calendar that has been used since the Xia Dynasty-the Summer Calendar, which takes twelve moons as a year, so the time of a year is ten days less than that of a return, so it is called the "lunar calendar", that is, the "lunar calendar". The moon is called the moon. It also contains calendar knowledge such as 24 solar terms, which is closely related to agricultural production, so it is also called "lunar calendar".