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Frequently asked questions
What is the leap year rule?
A year is a leap year if it is divisible by 4, except for century years (divisible by 100), which must also be divisible by 400 - this is why 2000 was a leap year but 1900 was not.
Why do leap years exist?
They keep the calendar year synchronized with Earth’s orbit around the sun, which takes approximately 365.24 days, not exactly 365.
Can I check years far in the future or past?
Yes, the calculation works for any whole number year, positive or historical.