Add working days
Date calculator
One tool for every date question. Count the days, weeks, months and years between two dates, with times if you need hours and minutes. Add or subtract a period from a date, count working days without weekends and public holidays, work out an exact age with the next birthday, or find the ISO week number and day of the year. Pick a calculation: days between two dates with optional times, adding or subtracting years, months, weeks and days, working days with public holidays, age from a date of birth, or the ISO week number. Results update as you type, undo reverts every change and your inputs are saved in this browser.
How it works
- Pick a mode: days between dates, add or subtract, working days, age or week number.
- Enter the dates, and optionally times, a period to add or a country for public holidays.
- Read the results at once, copy them, or save the calculation as JSON, PDF or image.
Correct around month ends and leap years
Adding a month to 31 January gives the last day of February, 28 or 29 depending on the year. Day counts use the real Gregorian calendar, so leap days are included, and hour counts follow daylight saving time changes in your time zone.
Public holidays built in
For the Netherlands, Belgium, Germany, France, the United Kingdom and the United States the national public holidays are calculated by rule, including Easter based days such as Easter Monday, Ascension Day and Whit Monday, so you can count working days for any year.
Frequently asked questions
Is the date calculator free?
Yes. It is free, needs no account and works in any modern browser. Your inputs stay in this browser.
Does the day count include the end date?
By default it counts the days from the start to the end, so Monday to Tuesday is one day. Turn on the option to include the end date to add one day, which is useful for counting days of leave.
How is the week number calculated?
It uses ISO 8601: weeks start on Monday and week 1 is the week with the first Thursday of the year. That is why 1 January can fall in week 52 or 53 of the previous year.
Related tools
The story behind the date calculator
How our calendar works: the Gregorian reform of 1582, the leap year rule, ISO 8601 week numbers and the Easter computus behind movable public holidays.
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