The leap year system makes the calendar coincide with the cycle of the seasons. ![]() So, any year divisible by four is a leap year! (for this centuty). How to Know if Certain Year is a Leap Year The 3 conditions for a given year be a leap year are: The year is exactly divisible by four (with no reminder) If the year is divisible by 100 (years ending in two zeros), it is not a leap, except if It is also divisible by 400 (in this case it will be a leap year). So, we can surely say that: "until 2096, if we want to know if a given year is leap or not, we just need to check if thath year is or is not divisible by 4. For this century, is not necessary to check the other conditions. The year being divisible by 4 is a necessary condition, but not sufficient for a year to be leap, but for this century, we may consider sufficient until the year 2098. 2018 is not divisible 4 (= 504.5), so it will not be a leap year (it is not necessary to check the next two conditions).(It is not necessary to check the third condition) 2020 is not divisible by 100 (= 20.2), so it will be a leap year. ![]() So, we conclude that 2000 was a leap year. 1900 is divisible by 4 and also by 100, but not by 400, so not a leap year. Centuries such as 19 only have a leap day if they are divisible by 400. Note: The above rule does not apply to century years. 2000 is divisible by 100 (2000/100 = 20), So, it could not have been a leap year, but.To learn more about the rules regarding what constitutes a leap year and why we have. It is also divisible by 400 (in this case it will be a leap year). Here is list of past and future Leap Years. ![]()
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