Define a period

...

How many working days in year 1976?

Here is the detail of the calculation:

Because 1976 is a leap year, it has 366 days.

Let's remove 52 saturdays and 52 sundays. It remains 262 days.

Now, let's remove 7 public holidays that do not fall during a weekend and we obtain 255 working days in 1976.

Here is the list of these 7 public holidays:

1. Første nyttårsdag : Thursday, 1 January, 1976
2. Skjærtorsdag : Thursday, 15 April, 1976
3. Langfredag : Friday, 16 April, 1976
4. Andre påskedag : Monday, 19 April, 1976
5. Grunnlovsdagen : Monday, 17 May, 1976
6. Kristi Himmelfartsdag : Thursday, 27 May, 1976
7. Andre pinsedag : Monday, 7 June, 1976

And here are the 5 public holidays falling on a weekend:

1. Første påskedag : Sunday, 18 April, 1976
2. Første mai : Saturday, 1 May, 1976
3. Første pinsedag : Sunday, 6 June, 1976
4. Første Juledag : Saturday, 25 December, 1976
5. Andre Juledag : Sunday, 26 December, 1976