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How many working days in year 1959?
Here is the detail of the calculation:
Because 1959 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 8 public holidays that do not fall during a weekend and we obtain 253 working days in 1959.
 Here is the list of these 8 public holidays: 
 
 1. Nieuwjaar : Thursday, 1 January, 1959 
2. Goede Vrijdag : Friday, 27 March, 1959 
3. Tweede Paasdag : Monday, 30 March, 1959 
4. Koninginnedag : Thursday, 30 April, 1959 
5. Bevrijdingsdag : Tuesday, 5 May, 1959 
6. Hemelvaartsdag : Thursday, 7 May, 1959 
7. Tweede Pinksterdag : Monday, 18 May, 1959 
8. Eerste Kerstdag : Friday, 25 December, 1959 
And here are the 3 public holidays falling on a weekend:
1. Eerste Paasdag : Sunday, 29 March, 1959 
2. Eerste Pinksterdag : Sunday, 17 May, 1959 
3. Tweede Kerstdag : Saturday, 26 December, 1959