How to use the leap year checker
Enter a four-digit year to learn whether February has 28 or 29 days.
How the calculation works
A year is a leap year if divisible by 4, except century years must also be divisible by 400. For example, 2000 was a leap year and 1900 was not.
Check your inputs carefully: an incorrect date can change a result. Dates and times are entered using your device settings, and no account is needed. For formal, legal, medical or financial purposes, verify the applicable local rules and official records.
Frequently asked questions
Was the year 2000 a leap year?
Yes. A century year is a leap year if it is divisible by 400.
Which time zone is used?
Dates use your device’s local calendar day. Date-only calculations avoid daylight-saving day-length errors.
Are the dates I enter uploaded?
No. AgeGlide calculates your results in your browser. Entered dates are not sent to our server for processing.