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How many working days in year 2019?
Here is the detail of the calculation:
Because 2019 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 2019.
 Here is the list of these 10 public holidays: 
 
 1. Neujahrstag : Tuesday, 1 January, 2019 
2. Ostermontag : Monday, 22 April, 2019 
3. Staatsfeiertag : Wednesday, 1 May, 2019 
4. Christi Himmelfahrt : Thursday, 30 May, 2019 
5. Pfingstmontag : Monday, 10 June, 2019 
6. Fronleichnam : Thursday, 20 June, 2019 
7. Mariä Himmelfahrt : Thursday, 15 August, 2019 
8. Allerheiligen : Friday, 1 November, 2019 
9. Weihnachten : Wednesday, 25 December, 2019 
10. Stefanitag : Thursday, 26 December, 2019 
And here are the 4 public holidays falling on a weekend:
1. Heilige Drei Könige : Sunday, 6 January, 2019 
2. St. Florian : Saturday, 4 May, 2019 
3. Nationalfeiertag : Saturday, 26 October, 2019 
4. Mariä Empfängnis : Sunday, 8 December, 2019