Date & Time Calculators and Converters
Exact age, days between dates, add or subtract days, Unix timestamp conversion, time durations and leap years — accurate calendar maths in your browser.
7 free tools
Age Calculator
Your exact age in years, months and days — plus total days, weeks, hours and a countdown to your next birthday.
Date Difference Calculator
Date difference calculator for the days, weeks, months and business days between two dates.
Add or Subtract Days Calculator
Add or subtract years, months, weeks and days (or business days) from any date.
Unix Timestamp to Date Converter
Convert Unix epoch timestamps (seconds, milliseconds or microseconds) to human-readable dates in UTC and local time.
Date to Unix Timestamp Converter
Convert a calendar date and time to a Unix timestamp in seconds and milliseconds, in local time or UTC.
Time Duration Calculator
Hours and minutes between two times (overnight shifts included) and add or subtract HH:MM durations.
Leap Year Checker
Check whether any year is a leap year using the Gregorian rules, with the number of days in the year and in February.