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How many working days in year 1945?
Here is the detail of the calculation:
Because 1945 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 1945.
 Here is the list of these 10 public holidays: 
 
 1. Første nyttårsdag : Monday, 1 January, 1945 
2. Skjærtorsdag : Thursday, 29 March, 1945 
3. Langfredag : Friday, 30 March, 1945 
4. Andre påskedag : Monday, 2 April, 1945 
5. Første mai : Tuesday, 1 May, 1945 
6. Kristi Himmelfartsdag : Thursday, 10 May, 1945 
7. Grunnlovsdagen : Thursday, 17 May, 1945 
8. Andre pinsedag : Monday, 21 May, 1945 
9. Første Juledag : Tuesday, 25 December, 1945 
10. Andre Juledag : Wednesday, 26 December, 1945 
And here are the 2 public holidays falling on a weekend:
1. Første påskedag : Sunday, 1 April, 1945 
2. Første pinsedag : Sunday, 20 May, 1945