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How many working days in year 1919?
Here is the detail of the calculation:
Because 1919 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 9 public holidays that do not fall during a weekend and we obtain 252 working days in 1919.
 Here is the list of these 9 public holidays: 
 
 1. Nieuwjaar : Wednesday, 1 January, 1919 
2. Goede Vrijdag : Friday, 18 April, 1919 
3. Tweede Paasdag : Monday, 21 April, 1919 
4. Koninginnedag : Wednesday, 30 April, 1919 
5. Bevrijdingsdag : Monday, 5 May, 1919 
6. Hemelvaartsdag : Thursday, 29 May, 1919 
7. Tweede Pinksterdag : Monday, 9 June, 1919 
8. Eerste Kerstdag : Thursday, 25 December, 1919 
9. Tweede Kerstdag : Friday, 26 December, 1919 
And here are the 2 public holidays falling on a weekend:
1. Eerste Paasdag : Sunday, 20 April, 1919 
2. Eerste Pinksterdag : Sunday, 8 June, 1919