Date and time tools

Count days between dates, add or subtract days, work out business days and ages, convert time zones and find a meeting time that suits everyone.

  • Free
  • No sign-up
  • Runs in your browser

Popular searches

Ready-made pages for the most common conversions, calculations and formats.

Time zone converter

All tools in this category

Business days calculatorCount working days between two dates, or add business days to a date. Days between two datesHow many days, weeks, months and years are there between two dates? Time zone converterConvert a time between time zones and see it in up to four cities at once. Add or subtract days from a dateWhat date is it after adding or subtracting days, weeks, months or years? Age calculatorExact age from a date of birth, and the days until the next birthday. Meeting time finderFind hours when people in different time zones are all within their working day. Time duration calculatorHours and minutes between two times, or the total of a list of durations. Countdown timerA live countdown to a date and time, and a simple timer with a sound. Week number calculatorWhich week of the year is it, and which dates does a given week cover?

What you can do here

Dates look simple until you have to count them: how many days until a deadline, what date is 90 days from today, how many working days fall between two dates, or what time it is in three cities at once. These calculators answer each question directly and show the working, so you can trust the result.

They handle the awkward parts for you, including leap years, months of different lengths, weekends and time-zone changes. Everything runs in your browser and nothing you enter is stored or sent anywhere.

  • Between dates: days, weeks, months and years between two dates, and business days without weekends.
  • Add and subtract: find the date that is N days, weeks or months away.
  • People and time: age calculator, week numbers and working-hours duration.
  • Time zones: convert between cities and find a meeting slot that works for all.

Frequently asked questions

Do the calculators include the start date?
Each tool states whether it counts the first and last day, and you can switch it on or off where it matters.
Do they handle leap years?
Yes. Leap years and month lengths are handled correctly.
Can I exclude weekends and holidays?
The business days calculator excludes weekends and lets you exclude the holidays you enter.
Are time zones adjusted for daylight saving?
Yes. The converter uses the time-zone database of your browser, which knows each region's daylight saving rules.
Is my data stored?
No. Everything is calculated in your browser.