What is a leap year?

There are many leap years, such as 2000, 2004 and 2008.

Calculation of leap year in Gregorian calendar

1, leap year is a year that can be divisible by 4 for the whole hundred years. (For example, 2004 is a leap year, but 20 10 is not. )

2. Leap year can be divided by 400 for one hundred years. (For example, 2000 is a leap year, 1900 is not. )

3. For a year with large values, if it can be divisible by 3200 and 172800, it is a leap year. For example, 172800 is a leap year, but 86400 is not (because it can be divisible by 3200, but not by 172800) (this is calculated in 365 days, 5h48' 45.5').