Leap Year Checker
Use the Leap Year Checker to check whether a year has 365 or 366 days quickly on mobile or desktop.
Leap Year Checker
Tool inputs are not stored, and private values stay out of analytics.
Result
How it works
Enter the required date or time, adjust the options, then run the Leap Year Checker for a clear copyable result.
The tool works by applying the Gregorian divisibility rules for 4, 100, and 400. Processing stays in the browser, and entered date or time values are not stored or sent to analytics.
Examples
Practical example
The year 2028 is a leap year with 366 days.
Accuracy note
Check the time zone and date format when comparing a result with another system.
FAQ
How do I use the Leap Year Checker?
Enter the requested values, review the options, then calculate and read the result.
Are entered dates or times stored?
No. The calculation runs in the browser and input values are not stored.
Does it work on mobile?
Yes. The controls and results are designed for phones and desktop browsers.