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Leap Year Checker

Check Gregorian leap-year rules and report the number of days in the year.

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Gregorian leap year test online

Check the number of days in a Gregorian year. Century years are leap years only when divisible by 400.

How to use it

Enter Year or select Try example. Review the displayed input. Select Run tool and inspect the result before copying or downloading.

Worked examples

Check the number of days in a Gregorian year.

Worked example — Leap Year Checker

Settings: No additional options

Input:

2028

Output:

2028: Leap year · 366 days

Limitations and common mistakes

  • Century years are leap years only when divisible by 400.

Frequently asked questions

How can I check whether a year is a leap year online?

Enter Year or select Try example. Review the displayed input. Select Run tool and inspect the result before copying or downloading.

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.

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