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Date & Time

Leap Years Checker

Check leap Years and report any problems. Enter the date or time values, choose the format, then review the result.

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Check leap Years and report any problems. Enter the date or time values, choose the format, then review the result.

This tool runs open-source code from OmniTools (MIT License). See open-source credits.

Leap Years Checker applies the Gregorian rule: years divisible by four are leap years, except centuries not divisible by 400.

It reports 1900 as non-leap, 2000 as leap, and 2024 as leap. The operation runs in your browser. Processing runs in the browser.

Instructions

  1. Provide text or data for this tool.
  2. Enter one to four digits per line.
  3. Review each year separately.
  4. Use Gregorian interpretation for historical comparisons.

Example

Input: 1900 2000 2024

Settings: Leap Years Checker: Enter one year per line.

Result: It reports 1900 as non-leap, 2000 as leap, and 2024 as leap. The operation runs in your browser.

Limits

  • Leap Years Checker: Signed values and decimals do not match.
  • Leap Years Checker: Date strings are not accepted as year input.
  • Leap Years Checker: The result does not select a calendar for you.

Questions

How does the leap-year checker handle century years?

It applies the Gregorian rule: divisible by 4, except centuries not divisible by 400. Therefore 1900 is not a leap year, while 2000 is.

Can I check several leap years together?

Enter one year per line. The tool removes empty lines and reports each remaining year separately.

Why does the checker reject a year?

The input must contain one to four digits per year. Signed values, decimals, and date strings do not match this tool’s year input format.