Verify whether a year has February 29—useful for calendars, age logic, or date library tests.
Year
Result
Enter a year.
How it works
A year is leap if it is divisible by 4, unless divisible by 100, except when divisible by 400.
Examples: 2000 is leap; 1900 is not; 2024 is leap.
Gregorian calendar
These are the standard rules used by most modern software for civil dates.
BC years
Enter positive integers for CE years; historical BC numbering is not supported.
Common questions
- February 29?
- Leap years add one day in February.
- Julian calendar?
- This tool uses Gregorian rules only.
- Year 0?
- Use positive year numbers; year 0 is not entered.
- Privacy?
- Nothing leaves this page.