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How many working days in year 2005?
Here is the detail of the calculation:
Because 2005 is not a leap year, it has 365 days.
Let's remove 53 saturdays and 52 sundays. It remains 260 days.
Now, let's remove 7 public holidays that do not fall during a weekend and we obtain 253 working days in 2005.
 Here is the list of these 7 public holidays: 
 
 1. Skjærtorsdag : Thursday, 24 March, 2005 
2. Langfredag : Friday, 25 March, 2005 
3. Andre påskedag : Monday, 28 March, 2005 
4. Kristi Himmelfartsdag : Thursday, 5 May, 2005 
5. Andre pinsedag : Monday, 16 May, 2005 
6. Grunnlovsdagen : Tuesday, 17 May, 2005 
7. Andre Juledag : Monday, 26 December, 2005 
And here are the 5 public holidays falling on a weekend:
1. Første nyttårsdag : Saturday, 1 January, 2005 
2. Første påskedag : Sunday, 27 March, 2005 
3. Første mai : Sunday, 1 May, 2005 
4. Første pinsedag : Sunday, 15 May, 2005 
5. Første Juledag : Sunday, 25 December, 2005