Define a period

...

How many working days in year 2018?

Here is the detail of the calculation:

Because 2018 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 10 public holidays that do not fall during a weekend and we obtain 251 working days in 2018.

Here is the list of these 10 public holidays:

1. Første nyttårsdag : Monday, 1 January, 2018
2. Skjærtorsdag : Thursday, 29 March, 2018
3. Langfredag : Friday, 30 March, 2018
4. Andre påskedag : Monday, 2 April, 2018
5. Første mai : Tuesday, 1 May, 2018
6. Kristi Himmelfartsdag : Thursday, 10 May, 2018
7. Grunnlovsdagen : Thursday, 17 May, 2018
8. Andre pinsedag : Monday, 21 May, 2018
9. Første Juledag : Tuesday, 25 December, 2018
10. Andre Juledag : Wednesday, 26 December, 2018

And here are the 2 public holidays falling on a weekend:

1. Første påskedag : Sunday, 1 April, 2018
2. Første pinsedag : Sunday, 20 May, 2018