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Leap Year Checker

Leap Year Checker is part of Toolspire and is ready as soon as this page loads. 2024 is a leap year. 1900 is not, because it is a century not divisible by 400. 2000 is a leap year, because it is.

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What you can do here

The century exception is the point

A checker that only tests “divisible by 4” marks 1900 as a leap year. This one does not.

2000 kept as a leap year

Divisible by 400 puts the century back in. That case is tested, not only the 1900 rejection.

Day count in the detail

366 or 365 is the number to use when a February payslip or a day-count looks one short.

The sequence

How to use the Leap Year Checker

  1. 1

    Type the calendar year

    2024, not “24”. A two-digit year is a different century and will be read as year 24.

  2. 2

    Test both exceptions

    Run 1900 and 2000. One is not a leap year and one is. If both say the same thing, the century rule is missing.

  3. 3

    Use 366 only when the detail says so

    Do not add 29 February to a 1900 calendar. The page’s day count is the reminder.

Worth knowing

  • Leap Year Checker on Toolspire: A year is a leap year when it is divisible by 4, unless it is divisible by 100 and not by 400.
  • 2024 is a leap year. 1900 is not. 2000 is.
  • The detail says 366 days or 365 days, which is the consequence people need for a February calendar.
  • Year 0 and negatives are rejected. The Gregorian rule is applied as the arithmetic test, not as a history of when each country adopted it.

Why centuries are special

The Julian calendar had a leap day every four years, and the year drifted. The Gregorian reform skips the leap day in century years unless the century is divisible by 400. 1900 was skipped. 2000 was not. This page applies that arithmetic. It does not try to know whether a country had switched to the Gregorian calendar by the year you type, so very old dates can disagree with a local historical calendar.

FAQ

Questions about Leap Year Checker

Where does Leap Year Checker run?

Leap Year Checker runs in this tab on Toolspire. What you type or drop in is not sent to us and is not stored on a server.

Is 2024 a leap year?

Yes. It is divisible by 4 and it is not a century, so it has 366 days.

Was 1900 a leap year?

No. It is divisible by 100 and not by 400, so the leap day was skipped. It had 365 days.

Was 2000 a leap year?

Yes. It is divisible by 400, so the century exception does not apply.

Does this know when a country adopted the calendar?

No. It is the Gregorian arithmetic test only. A date in the 1500s may have been counted differently where the reform arrived later.

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