Count the days between two dates, working days excluding weekends and Danish public holidays, ISO week numbers as used in Denmark and ages – plus probation, notice and anniversary dates under Danish employment rules.
Danish rules
This calculator applies Danish law and Danish collective agreements. It is for employment in Denmark and does not reflect the rules of other countries.
Fill in the fields and press Calculate to see the result.
Fill in the fields and press Calculate to see the result.
Fill in the fields and press Calculate to see the result.
Fill in the fields and press Calculate to see the result.
The date calculator counts how many days there are between two dates — as calendar days, in weeks or as working days excluding weekends and Danish public holidays (helligdage). It also adds days, weeks and months to a date, finds ISO week numbers as used in Denmark, calculates ages, and works out deadlines and anniversaries in an employment relationship under Danish rules.
Choose the Days between tab, enter a from date and a to date, and press Calculate. The result is the difference in calendar days: from 1 January to 2 January is 1 day. If both the first and the last day should count — for example an employment running from 1 January up to and including 30 June — tick Include the end date, and the calculator adds one day. You also get the number of weeks and the period in years, months and days.
If weekends and public holidays should be deducted, use the Working days tab. The holiday list is the Danish one, so it fits work in Denmark; you choose which weekdays are working days and which Danish public holidays are days off. Choose Add working days if you need to find a deadline: the calculator counts from the day after the start date and skips weekends and public holidays, so 10 working days from Friday 20 November 2026 gives Friday 4 December.
Find the date of an employee’s work anniversary. In the »Employment« tab, enter the start date 1 August 2018.
Find the exact number of calendar days in a fixed-term employment. Enter 1 January 2026 to 30 June 2026 and tick »Include the end date«.
A salaried employee (funktionær) in Denmark is given notice on 30 September with 3 months’ notice. In the »Add/subtract« tab, enter the date of notice and add 3 months.
The calculator adds plain calendar months. Under section 2 of the Salaried Employees Act (funktionærloven § 2), however, employment ends at the end of a month, so the actual termination date is 31 December. The notice period calculator takes this into account.
You are planning a rota and want to know which ISO week Christmas Eve falls in. In the »Week number« tab, enter 24 December 2026.
You are registering an employee in a pension system and need their exact age today. In the »Age« tab, enter the date of birth 15 May 1980.
Find the number of working days in an employee’s last month. In the »Working days« tab, enter the start 1 November 2026 and the end 30 November 2026. Weekends and Danish public holidays are deducted — November has no public holidays in Denmark. If you need to plan a whole year with standard hours and time off in lieu, use Public holidays and working hours.
Use the »Employment« tab to get an overview of your employees’ anniversaries and seniority.
Know the exact number of calendar days for deadlines, e.g. when you apply the 120-day rule in section 5(2) of the Salaried Employees Act (funktionærloven § 5, stk. 2).
Check whether your collective agreement (overenskomst) uses calendar days or working days to calculate deadlines.
If you work in Denmark, calculate your exact termination date so you know when your notice period ends.
Find your own milestones. Under many Danish collective agreements (overenskomster), anniversaries can entitle you to a bonus (gratiale) or extra days off. If you are planning leave, the parental leave calculator works out the dates for both parents.
Use the calculator to check that the balance between holiday taken and actual working days matches your notice period. The rules on notifying and taking holiday are in the Danish Holiday Act (ferieloven).
Collective agreements (overenskomster) and individual agreements can provide longer notice periods than the Salaried Employees Act. Always check your own agreements before relying on a calculation.
=B1-A1 gives the number of days. You find working days excluding weekends with =NETWORKDAYS(A1,B1), and you can deduct public holidays by giving a list of them as the third argument. The date calculator gives the same result without formulas.Content last reviewed September 2026.