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How many working days in year 1928?
Here is the detail of the calculation:
Because 1928 is a leap year, it has 366 days.
Let's remove 52 saturdays and 53 sundays. It remains 261 days.
Now, let's remove 7 public holidays that do not fall during a weekend and we obtain 254 working days in 1928.
 Here is the list of these 7 public holidays: 
 
 1. Goede Vrijdag : Friday, 6 April, 1928 
2. Tweede Paasdag : Monday, 9 April, 1928 
3. Koninginnedag : Monday, 30 April, 1928 
4. Hemelvaartsdag : Thursday, 17 May, 1928 
5. Tweede Pinksterdag : Monday, 28 May, 1928 
6. Eerste Kerstdag : Tuesday, 25 December, 1928 
7. Tweede Kerstdag : Wednesday, 26 December, 1928 
And here are the 4 public holidays falling on a weekend:
1. Nieuwjaar : Sunday, 1 January, 1928 
2. Eerste Paasdag : Sunday, 8 April, 1928 
3. Bevrijdingsdag : Saturday, 5 May, 1928 
4. Eerste Pinksterdag : Sunday, 27 May, 1928