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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. Lunes de Carnaval : Monday, 27 February, 2017 
2. Martes de Carnaval : Tuesday, 28 February, 2017 
3. Jueves Santo : Thursday, 13 April, 2017 
4. Viernes Santo : Friday, 14 April, 2017 
5. Declaración de la Independencia : Wednesday, 19 April, 2017 
6. Día Internacional de los Trabajadores : Monday, 1 May, 2017 
7. Celebración de la constitución de un primer gobierno dentro del proceso de independencia nacional iniciado en la Revolución de Mayo. : Thursday, 25 May, 2017 
8. Día de San Pedro y San Pablo : Thursday, 29 June, 2017 
9. Conmemora de la Declaración de independencia nacional de Venezuela (5 de julio de 1811) : Wednesday, 5 July, 2017 
10. Natalicio del libertador Simón Bolívar : Monday, 24 July, 2017 
11. Día de la Resistencia Indígena : Thursday, 12 October, 2017 
12. Navidad : Monday, 25 December, 2017 
And here are the 4 public holidays falling on a weekend:
1. Año Nuevo : Sunday, 1 January, 2017 
2. Batalla de Carabobo : Saturday, 24 June, 2017 
3. Nochebuena : Sunday, 24 December, 2017 
4. Nochevieja : Sunday, 31 December, 2017