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How many working days in year 1986?
Here is the detail of the calculation:
Because 1986 is not a leap year, it has 365 days.
Let's remove 52 saturdays and 52 sundays. It remains 261 days.
Now, let's remove 9 public holidays that do not fall during a weekend and we obtain 252 working days in 1986.
 Here is the list of these 9 public holidays: 
 
 1. Nytårsdag : Wednesday, 1 January, 1986 
2. Skærtorsdag : Thursday, 27 March, 1986 
3. Langfredag : Friday, 28 March, 1986 
4. 2. påskedag : Monday, 31 March, 1986 
5. Store Bededag : Friday, 25 April, 1986 
6. Kristi Himmelfartsdag : Thursday, 8 May, 1986 
7. 2. pinsedag : Monday, 19 May, 1986 
8. Juledag : Thursday, 25 December, 1986 
9. 2. juledag : Friday, 26 December, 1986 
And here are the 2 public holidays falling on a weekend:
1. Påskedag : Sunday, 30 March, 1986 
2. Pinsedag : Sunday, 18 May, 1986