Leap Year Checker

When to use?

Use it to check whether a year is a leap year, or to verify whether Feb 29 exists when working through date logic.

How to use

• Enter a year.
• Whether it is a leap year and the number of days in February are shown instantly.

Input Explanation

Enter the four-digit year to check.

Calculation Basis

Leap-year rule: divisible by 4 is a leap year, except divisible by 100 is common, except divisible by 400 is a leap year again.

Usage Examples

• Check leap-year status - Instantly see whether a year is a leap year or a common year.
• Assist date logic - Verify whether Feb 29 exists to validate date-related logic.
• Check days in a year - See February's day count and the full-year day count for a given year.

Examples

• 2024 → leap year (multiple of 4), up to Feb 29
• 2100 → common year (multiple of 100 but not 400), up to Feb 28

Cautions

• It applies the Gregorian leap-year rule, which differs from other calendars such as the Julian calendar.
• It follows the Gregorian cycle (400-year period), which does not match leap cycles in other ancient calendar systems.

Guides

Leap-year rule

Divisible by 4 is a leap year, except divisible by 100 is common, except divisible by 400 is a leap year again. So 2000 was a leap year and 1900 was not.

Care with Feb 29

Including Feb 29, which exists only in leap years, can change a date calculation by one day. Check the date difference or D-day tools too.

FAQ

What is the leap-year rule?

Divisible by 4, except divisible by 100 is common, except divisible by 400 is a leap year again.

How many days is February in a leap year?

29 days in a leap year, 28 in a common year.

Why do we have leap years?

Earth's orbit takes about 6 hours more than 365 days, so a day is added every 4 years to keep the calendar aligned with the seasons.

Was 2000 a leap year?

Yes. It is divisible by 400, so 2000 was a leap year, while 1900 was a common year.

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