Reasoning
Calendar Leap Year Rule
Determine whether a Gregorian calendar year is a leap year.
Leap Year: divisible by 400, or divisible by 4 but not by 100
Formula Explanation
Century years are leap years only when divisible by 400.
Variables Explained
Year = Gregorian calendar year being checked.
Solved Example
Is 2100 a leap year?
2100 is divisible by 100 but not by 400, so it is not a leap year.