Tool capabilities
- Input
- TXT
- Output
- TXT · JSON
How to use Leap Year Checker
Check the Gregorian leap-year rule for the selected date’s year. This leap year checker works directly in your browser and is free to use without an account.
- Paste or open your input in the editor.
- Run the tool and inspect the output. If the input is invalid, correct the reported error and run it again.
- Copy the result or download it to your device.
Leap Year Checker · Example
Input
2026-09-08
Output
{
"year": 2026,
"leapYear": false,
"daysInYear": 365
}Check the Gregorian leap-year rule for the selected date’s year.
Usage notes
Inputs and results are processed on this device. Tool content is not sent to a processing server.