Leap Year Checker
Check if any year is a leap year with advanced algorithms, calendar analysis, and educational content. Learn about leap year rules and history!
Leap Year Checker
Enter a year to check if it's a leap year
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Enter a year below to see if it's a leap year!
Year Input
Year Range Analysis
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Leap Year Algorithm
A year is a leap year if it is divisible by 4, except for years divisible by 100, unless they are also divisible by 400.
if (year % 400 == 0) return true;
if (year % 100 == 0) return false;
if (year % 4 == 0) return true;
return false;
if (year % 100 == 0) return false;
if (year % 4 == 0) return true;
return false;
Leap Year Facts
Julian Calendar: Every 4th year was a leap year
Gregorian Calendar: More precise rules introduced in 1582
Century Years: Only divisible by 400 are leap years
Leap Day: February 29th occurs every 4 years
Duration: Leap years have 366 days instead of 365
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