Free Date CalculatorDays between dates, and dates from days.

Count the years, months and days between two dates, with the total days, weeks and weekdays.
Or add and subtract days, weeks, months and years to find a deadline or an anniversary.

Days between datesWeekday countAdd & subtract

No sign-up Unlimited use Remembers your numbers

Start date

End date

Count the end day too

Pick an end date to count the time between.

Calculated on your device. What you type is not sent anywhere.

THREE SIMPLE STEPS

How to use the Date Calculator

Pick the mode

Count the time between two dates, or add and subtract from a date.

Enter the dates

Pick the start and end dates, or a date and the years, months, weeks and days to add.

Read the result

See years, months and days, total days and weeks, weekdays or the new date with its weekday.

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Date Calculator FAQ

How do I count the days between two dates?

Pick a start and an end date. You get the difference in years, months and days, plus the total days, weeks and weekdays. Tick Count the end day too to include both days.

How do I add days to a date?

Choose Add or subtract, pick a date and enter days, weeks, months or years. 90 days after 11 October 2026 is 9 January 2027.

What happens when I add a month to 31 January?

The day doesn't exist in February, so the last day of February is used: 28 February, or 29 in a leap year.

Does the weekday count skip holidays?

No. It counts Monday to Friday. Holidays differ by country, so subtract them yourself for working days.

Can time zones change the result?

No. The calculator works on calendar days, so daylight saving time and time zones never shift the answer.

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