Date & Time calculator
Leap Year Checker
Check if a year is a leap year.
About the leap year checker
The leap year checker determines whether any year is a leap year and finds the nearest leap years.
How to use this calculator
- 1
Enter year
Enter any year between 1 and 9999.
- 2
View results
See if it's a leap year, days in the year, and nearest leap years.
How the calculation works
A year is a leap year if divisible by 4, except century years which must be divisible by 400.
Example: 2024 is a leap year. 2100 is not. 2000 was.
How date calculations work
Calendar math is trickier than it seems. Months have 28–31 days, leap years add an extra day every four years (except century years not divisible by 400), and time zones complicate exact hour counts. Our calculators use UTC-based date arithmetic to ensure consistent results regardless of your local time zone.
Important limitations
This tool provides a mathematical estimate based only on the values entered. It does not account for regulations, taxes, lender fees, market conditions, or individual circumstances. Results are for planning purposes only — consult a qualified professional for regulated, medical, financial, or construction decisions.
Frequently asked questions about leap year checker
How accurate is the leap year checker?+
The calculation follows the displayed formula and retains full numeric precision before formatting the result.
Can I use the result professionally?+
Use it as a planning estimate. Confirm regulated, medical, financial, or construction decisions with a qualified professional.