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Leap Year Checker
時間Check if a year is a leap year and find out when the next ones are.
ttb run leap-year-checker
The Algorithm
A year is a leap year if the following conditions are satisfied:
- The year is multiple of 400.
- The year is multiple of 4 and not multiple of 100.
No
2026 is not a leap year. (365 days)
Previous Leap Year
2024
Next Leap Year
2028
Following 5 Leap Years
20282032203620402044
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Leap Year Checker の使い方
Enter any year to check if it's a leap year. The tool explains the result using the actual leap year rules (divisible by 4, except centuries, unless divisible by 400). It also lists the next upcoming leap years and past leap years for quick reference.
1
Enter your parameters
Configure the inputs for the Leap Year Checker according to your specific needs.
2
View real-time results
The utility instantly processes your request and displays the calculated outputs directly in your browser.
3
Copy or Download
Click the copy icon next to the final output to instantly grab the result, or export it if applicable.
よくある質問
What are the leap year rules?+
A year is a leap year if: (1) it's divisible by 4, AND (2) if it's a century year (like 1900, 2000), it must also be divisible by 400. So 2000 was a leap year, but 1900 was not.
Why do we have leap years?+
Earth takes approximately 365.2422 days to orbit the Sun. Without the extra day every 4 years, our calendar would drift by about 24 days per century, eventually putting summer months in winter.