Tools

Leap Year Checker for Calendar Rules

Check whether a year is a leap year using standard rules.

Leap Year Checker

Verify whether a year includes an extra day in February. This helps with date validation and calendar calculations.

How to use the Leap Year Checker

  1. Enter the year.
  2. Click Check.
  3. Review the result.

Common use cases

  • Validating date calculations in code.
  • Preparing calendar logic for schedules.
  • Checking birthdays or anniversaries.
  • Auditing time-based data rules.

Tips & notes

  • Use Gregorian rules for modern dates.
  • Leap years add February 29.
  • Combine with date validators for full checks.

Related time tools

  • Date Format Validator
  • Month Calendar Generator
  • Days Between Two Dates

FAQ

What rule is used?
Divisible by 4, except centuries not divisible by 400.
Does it work for historical years?
Yes, using the standard Gregorian rules.
Why does 2000 count but 1900 not?
Centuries must be divisible by 400 to be leap years.