How to judge a flat year and a leap year: ① A leap year is a flat year divisible by 4. (For example, 2004 is a leap year, and 190 1 is not. ) Schematic diagram of the earth's revolution.
② A leap year is a century year divisible by 400 (for example, 2000 is a leap year, and 1900 is not).
February 29th of leap year.
February 28th in a normal year.
If the year is divided by an integer multiple of 4, it is a leap year, such as 2008, but it should be noted that it is divided by 400 every hundred years, such as 2 100 is not a leap year. Otherwise it will be a normal year.