Define a period

...

How many working days in year 2012?

Here is the detail of the calculation:

Because 2012 is a leap year, it has 366 days.

Let's remove 52 saturdays and 53 sundays. It remains 261 days.

Now, let's remove 8 public holidays that do not fall during a weekend and we obtain 253 working days in 2012.

Here is the list of these 8 public holidays:

1. Skjærtorsdag : Thursday, 5 April, 2012
2. Langfredag : Friday, 6 April, 2012
3. Andre påskedag : Monday, 9 April, 2012
4. Første mai : Tuesday, 1 May, 2012
5. Grunnlovsdagen : Thursday, 17 May, 2012
6. Andre pinsedag : Monday, 28 May, 2012
7. Første Juledag : Tuesday, 25 December, 2012
8. Andre Juledag : Wednesday, 26 December, 2012

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

1. Første nyttårsdag : Sunday, 1 January, 2012
2. Første påskedag : Sunday, 8 April, 2012
3. Første pinsedag : Sunday, 27 May, 2012