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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 12 public holidays that do not fall during a weekend and we obtain 248 working days in 2017.
 Here is the list of these 12 public holidays: 
 
 1. Heilige Drei Könige : Friday, 6 January, 2017 
2. Ostermontag : Monday, 17 April, 2017 
3. Staatsfeiertag : Monday, 1 May, 2017 
4. Christi Himmelfahrt : Thursday, 25 May, 2017 
5. Pfingstmontag : Monday, 5 June, 2017 
6. Fronleichnam : Thursday, 15 June, 2017 
7. Mariä Himmelfahrt : Tuesday, 15 August, 2017 
8. Nationalfeiertag : Thursday, 26 October, 2017 
9. Allerheiligen : Wednesday, 1 November, 2017 
10. Mariä Empfängnis : Friday, 8 December, 2017 
11. Weihnachten : Monday, 25 December, 2017 
12. Stefanitag : Tuesday, 26 December, 2017 
And here are the 2 public holidays falling on a weekend:
1. Neujahrstag : Sunday, 1 January, 2017 
2. St. Rupert : Sunday, 24 September, 2017