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How many working days in year 2137?
Here is the detail of the calculation:
Because 2137 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 2137.
 Here is the list of these 10 public holidays: 
 
 1. Nieuwjaarsdag : Tuesday, 1 January, 2137 
2. Paasmaandag : Monday, 8 April, 2137 
3. Dag van de Arbeid : Wednesday, 1 May, 2137 
4. Hemelvaartsdag : Thursday, 16 May, 2137 
5. Pinkstermaandag : Monday, 27 May, 2137 
6. Feest van de Vlaamse Gemeenschap : Thursday, 11 July, 2137 
7. Onze-Lieve-Vrouw Hemelvaart : Thursday, 15 August, 2137 
8. Allerheiligen : Friday, 1 November, 2137 
9. Wapenstilstand : Monday, 11 November, 2137 
10. Kerstmis : Wednesday, 25 December, 2137 
And here is the public holiday falling on a weekend:
1. Nationale Feestdag : Sunday, 21 July, 2137