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How many working days in year 2087?
Here is the detail of the calculation:
Because 2087 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 10 public holidays that do not fall during a weekend and we obtain 251 working days in 2087.
 Here is the list of these 10 public holidays: 
 
 1. Nieuwjaarsdag : Wednesday, 1 January, 2087 
2. Paasmaandag : Monday, 21 April, 2087 
3. Dag van de Arbeid : Thursday, 1 May, 2087 
4. Hemelvaartsdag : Thursday, 29 May, 2087 
5. Pinkstermaandag : Monday, 9 June, 2087 
6. Feest van de Vlaamse Gemeenschap : Friday, 11 July, 2087 
7. Nationale Feestdag : Monday, 21 July, 2087 
8. Onze-Lieve-Vrouw Hemelvaart : Friday, 15 August, 2087 
9. Wapenstilstand : Tuesday, 11 November, 2087 
10. Kerstmis : Thursday, 25 December, 2087 
And here is the public holiday falling on a weekend:
1. Allerheiligen : Saturday, 1 November, 2087