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Leap Year Checker - Online Verify February 29

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Leap Year Checker

Online Verify February 29 – Instantly check any year

Enter any positive integer year (supports years before Gregorian calendar for calculation)
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Learn the Rule

Understand why February 29 exists

Frequently Asked Questions

A leap year is a calendar year that contains an additional day – February 29. It has 366 days instead of the usual 365. This extra day keeps our calendar aligned with the Earth's revolutions around the Sun.

The Earth takes approximately 365.2422 days to orbit the Sun. Without leap years, the calendar would drift by about 24 days every century, eventually causing seasons to occur at the wrong time of the year. Leap years correct this drift.

Follow these three rules:
  • Divisible by 4 → candidate for leap year.
  • Divisible by 100 → NOT a leap year, unless...
  • Divisible by 400 → it IS a leap year.
Example: 2000 was a leap year (divisible by 400), but 1900 was not (divisible by 100 but not by 400).

Not exactly. Most years divisible by 4 are leap years, but century years (like 1700, 1800, 1900) are skipped unless they are also divisible by 400. So the pattern is: leap year every 4 years, with occasional 8‑year gaps across centuries.

Yes, our calculator applies the modern Gregorian rule mathematically. However, the Gregorian calendar was introduced in 1582, so historical years may not have been treated as leap years at the time. This tool shows the theoretical leap status.

Quickly verify any date, plan events, validate software logic, or satisfy curiosity. Programmers often test date-handling code with leap years, and educators use it to explain the calendar system. It’s free, instant, and mobile‑friendly.
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