There are 12 months, several big months and several small months in a year.

There are 7 big months and 5 small months in a year, of which 1, 3, 5, 7, 8, 10 and 12 are big months, and each month is 3 1 day; April, June and September 165438+ 10 are abortion, with 30 days per month; February is a leap month, once every four years, with 29 days and 28 days.

China traditional calendar:

Gregorian calendar refers to the solar calendar, or a kind of solar calendar. This calendar is related to the earth's annual orbit around the sun, and it is a universal calendar, also known as Gregorian calendar, solar calendar or AD calendar. China adopted the Gregorian calendar after the Revolution of 1911, and officially adopted the Gregorian calendar after the founding of 1949 People's Republic of China (PRC).

The Gregorian calendar has 365 days in a normal year and 366 days in a leap year, once every four years, once in a hundred years and once again in the 400th year, that is, there are 97 leap years every 400 years. The average length of the Gregorian calendar is only 26 seconds away from the tropical year. The Gregorian calendar came into being in the 6th century, and it began in the year when Jesus was born, when Christianity was in its heyday.

Lunar calendar, also called lunar calendar, is one of the traditional calendars in China, and it is also called lunar calendar, ancient calendar, Han calendar, yellow calendar and old calendar. The lunar calendar is a calendar arranged according to the moon phase cycle. The moon revolves around the earth for one month, that is, the calendar month is determined based on the new moon, and a year is twelve calendar months. Most traditional festivals in China are calculated according to the lunar calendar.