Date & Time
Leap Year Checker: Rules and Examples
Learn leap year rules and why they exist.
Leap years keep calendars aligned with Earth's orbit.
Rules
- Divisible by 4 → leap
- Except by 100 → not
- Except by 400 → leap
2000: leap. 1900: not. 2024: leap. 2100: not.
Why
Earth orbits in ~365.2425 days.
Frequently Asked Questions
2026 leap?
No. Not divisible by 4. Next: 2028.
Feb 28 days?
Roman calendar reforms.
Feb 29 birthdays?
Feb 28 or Mar 1 in non-leap.