Date & Time
7 free online Date & Time tools that run entirely in your browser.
Date Difference Calculator
Calculate the time between two dates.
Age Calculator
Calculate exact age from a date of birth.
Duration Formatter
Convert seconds into HH:MM:SS and human-readable time.
Date Add / Subtract
Add or subtract days, weeks, months or years.
Timezone Converter
Convert a date/time across timezones.
Leap Year Checker
Check whether a year is a leap year, and list nearby ones.
Day of the Week Finder
Find the weekday, week number and day-of-year for a date.