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A leap year in the Gregorian calendar occurs 97 times in every 400-year period, making the average length of a Gregorian calendar year 365.2425 days. The leap years are years that are evenly divisible by 4 with the exception of the last year of each of the first three centuries of every 400-years. So leap years are usually every four years, but most years that end with a double-zero are skipped.

Here is a guide to help you determine if a year is a leap year:

Is the year an even number?

No: It is NOT a leap year.

Yes: Is the year evenly divisible by 4?

No: It is NOT a leap year.

Yes: Is the year evenly divisible by 100?

No: It IS a leap year.

Yes: Is the year evenly divisible by 400?

No: It is NOT a leap year.

Yes: It IS a leap year.

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12y ago

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