Date & Time Tools

15 free tools

Add or subtract dates, calculate ages and date differences, convert Unix timestamps and time zones, and use an online stopwatch and countdown timer.

All 15 date & time tools

A precise online stopwatch with lap times.

Set a countdown with an audible alert when time is up.

Calculate exact age in years, months, days and more.

Add or subtract days, weeks, months and years from a date, with an optional business-days mode.

See how a date is written in 30+ countries and languages, plus ISO 8601, RFC 2822 and Unix formats.

Convert Unix timestamps to human dates and back.

See the exact current time, date and week number in your time zone and major cities.

Find the dates of Easter, Eid, Diwali, Chinese New Year, Christmas and other festivals for any year.

Find the ISO week number of any date, and the dates of any week of the year.

Count days, weeks and business days between two dates.

Add or subtract hours, minutes and seconds, or add time to a clock time.

Calculate the hours and minutes between two times or dates, with breaks.

Add up weekly work hours from start, end and break times and calculate pay with overtime.

Convert a time between time zones around the world.

Find the weekday you were born, your next birthday countdown, zodiac sign and fun age facts.

How to Use Stopwatch
Free online stopwatch with lap times. Start, pause and reset with one click or the keyboard, and record split intervals. Works in any browser.
How to Use Countdown Timer
Set an online countdown timer for any duration, with an optional alarm sound when time is up. Free timer for cooking, workouts, study and meetings.
How to Use Age Calculator
Calculate your exact age in years, months and days from your date of birth, or the age on any chosen date. Free online age calculator.
How to Use Date Calculator (Add & Subtract)
Add or subtract days, weeks, months and years from any date, or count business days only. See the result date, weekday, week number and day of year.
How to Use Localized Date Formats
See how a date and time are written in 30+ countries and languages, plus ISO 8601, RFC 2822, Unix and common numeric formats. Click any format to copy it.
How to Use Unix Timestamp Converter
Convert Unix timestamps to readable dates and dates back to epoch time, in seconds or milliseconds. Free online Unix timestamp converter for developers.