Do these tools work offline in the browser?

Yes. The calculations run in your browser, so nothing you enter is uploaded to a server.

Which date tool should I use?

Use the Age calculator for someone's age, Date Difference for days between two dates, Date Add/Subtract to shift a date, Countdown for days until an event, Working Days for business days, and Time Duration for hours between two times.

Date & Time

Date and time calculators for everyday planning.

Work out ages, days between dates, countdowns, business days and time durations. Everything runs in your browser.

Current category6 browser-based date and time calculators.

All date & time tools

AGE Age Calculator Work out an exact age in years, months and days from a date of birth. Date of birth to Age DIF Date Difference Calculator Count the days, weeks and months between two dates. Two dates to Duration PLM Date Add or Subtract Add or subtract days, weeks, months or years from a date. Date + amount to New date CDN Countdown Calculator Count how many days and weeks are left until a future date. Target date to Days left WD Working Days Calculator Count the business days (Monday to Friday) between two dates. Two dates to Business days DUR Time Duration Calculator Work out the hours and minutes between a start time and an end time. Two times to Duration

What are date and time calculators useful for?

Date maths is fiddly to do in your head: leap years, month lengths and weekends all get in the way. These calculators handle the awkward bits so you can quickly find an age, count the days to a deadline, add working days to a start date, or measure how long something took.

Every calculation runs in your browser, so the dates you enter stay on your device and the tools work instantly without a signup.

Frequently asked questions

Are these calculators free?

Yes. The date and time calculators are free to use in a modern web browser.

Do the dates I enter leave my device?

No. The calculations run in your browser, so nothing is uploaded.

Which tool should I start with?

Use the Age calculator for a date of birth, Date Difference for days between two dates, or Countdown for days until an event.