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How many working days in year 2017?
Here is the detail of the calculation:
Because 2017 is not a leap year, it has 365 days.
Let's remove 52 saturdays and 53 sundays. It remains 260 days.
Now, let's remove 9 public holidays that do not fall during a weekend and we obtain 251 working days in 2017.
 Here is the list of these 9 public holidays: 
 
 1. Ouschterméindeg : Monday, 17 April, 2017 
2. Dag vun der Aarbecht : Monday, 1 May, 2017 
3. Christi Himmelfaart : Thursday, 25 May, 2017 
4. Péngschtméindeg : Monday, 5 June, 2017 
5. Nationalfeierdag : Friday, 23 June, 2017 
6. Léiffrawëschdag : Tuesday, 15 August, 2017 
7. Allerhellegen : Wednesday, 1 November, 2017 
8. Chrëschtdag : Monday, 25 December, 2017 
9. Stiefesdag : Tuesday, 26 December, 2017 
And here is the public holiday falling on a weekend:
1. Neijoerschdag : Sunday, 1 January, 2017