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How many working days in year 2120?
Here is the detail of the calculation:
Because 2120 is a leap year, it has 366 days.
Let's remove 52 saturdays and 52 sundays. It remains 262 days.
Now, let's remove 10 public holidays that do not fall during a weekend and we obtain 252 working days in 2120.
 Here is the list of these 10 public holidays: 
 
 1. Nieuwjaarsdag : Monday, 1 January, 2120 
2. Paasmaandag : Monday, 15 April, 2120 
3. Dag van de Arbeid : Wednesday, 1 May, 2120 
4. Hemelvaartsdag : Thursday, 23 May, 2120 
5. Pinkstermaandag : Monday, 3 June, 2120 
6. Feest van de Vlaamse Gemeenschap : Thursday, 11 July, 2120 
7. Onze-Lieve-Vrouw Hemelvaart : Thursday, 15 August, 2120 
8. Allerheiligen : Friday, 1 November, 2120 
9. Wapenstilstand : Monday, 11 November, 2120 
10. Kerstmis : Wednesday, 25 December, 2120 
And here is the public holiday falling on a weekend:
1. Nationale Feestdag : Sunday, 21 July, 2120