Date & Time

Leap Year Calculator

Check whether any year is a leap year, discover the next ones, and understand the Gregorian rules behind February 29.

Gregorian rule: divisible by 4, but not by 100 unless also divisible by 400.

📅 Any year

Check 1900, 2000, 2100 — century-year edge cases handled.

🔁 Gregorian rules

Divisible by 400 rules correct for the full calendar.

📈 Future list

Preview the next leap years for planning and trivia.

🎯 Quick facts

Days in year, February days and neighbors all at once.

More date tools

Dates, calendars and time made easy.

Date Difference → Unix Timestamp Time Duration

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