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How many working days in year 2128?
Here is the detail of the calculation:
Because 2128 is a leap year, it has 366 days.
Let's remove 52 saturdays and 52 sundays. It remains 262 days.
Now, let's remove 7 public holidays that do not fall during a weekend and we obtain 255 working days in 2128.
 Here is the list of these 7 public holidays: 
 
 1. Nieuwjaarsdag : Thursday, 1 January, 2128 
2. Paasmaandag : Monday, 19 April, 2128 
3. Hemelvaartsdag : Thursday, 27 May, 2128 
4. Pinkstermaandag : Monday, 7 June, 2128 
5. Nationale Feestdag : Wednesday, 21 July, 2128 
6. Allerheiligen : Monday, 1 November, 2128 
7. Wapenstilstand : Thursday, 11 November, 2128 
And here are the 4 public holidays falling on a weekend:
1. Dag van de Arbeid : Saturday, 1 May, 2128 
2. Feest van de Vlaamse Gemeenschap : Sunday, 11 July, 2128 
3. Onze-Lieve-Vrouw Hemelvaart : Sunday, 15 August, 2128 
4. Kerstmis : Saturday, 25 December, 2128