Define a period

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How many working days in year 2000?

Here is the detail of the calculation:

Because 2000 is a leap year, it has 366 days.

Let's remove 53 saturdays and 53 sundays. It remains 260 days.

Now, let's remove 9 public holidays that do not fall during a weekend and we obtain 251 working days in 2000.

Here is the list of these 9 public holidays:

1. Skjærtorsdag : Thursday, 20 April, 2000
2. Langfredag : Friday, 21 April, 2000
3. Andre påskedag : Monday, 24 April, 2000
4. Første mai : Monday, 1 May, 2000
5. Grunnlovsdagen : Wednesday, 17 May, 2000
6. Kristi Himmelfartsdag : Thursday, 1 June, 2000
7. Andre pinsedag : Monday, 12 June, 2000
8. Første Juledag : Monday, 25 December, 2000
9. Andre Juledag : Tuesday, 26 December, 2000

And here are the 3 public holidays falling on a weekend:

1. Første nyttårsdag : Saturday, 1 January, 2000
2. Første påskedag : Sunday, 23 April, 2000
3. Første pinsedag : Sunday, 11 June, 2000