Check if a year is a leap year and find leap years in range
Calculate the difference between two dates in years, months, days
Generate visual month/year calendar with custom options
Format dates in ISO 8601, US, EU, Unix timestamp and more
Convert between Unix timestamps and human-readable dates
The Leap Year Checker determines whether any year is a leap year and explains why. It shows the mathematical rules (divisible by 4, not by 100, unless by 400), the number of days in February, and lets you find all leap years in a given range. Educational and practical for date calculations, scheduling, and understanding the calendar system.