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How many working days in year 2007?
Here is the detail of the calculation:
Because 2007 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 2007.
 Here is the list of these 10 public holidays: 
 
 1. Año Nuevo : Monday, 1 January, 2007 
2. Jueves santo : Thursday, 5 April, 2007 
3. Viernes Santo : Friday, 6 April, 2007 
4. Fiesta del Trabajo : Tuesday, 1 May, 2007 
5. San Antonio : Wednesday, 13 June, 2007 
6. Asuncíon de la Virgen : Wednesday, 15 August, 2007 
7. Fiesta nacional de España : Friday, 12 October, 2007 
8. Todos los Santos : Thursday, 1 November, 2007 
9. Día de la Constitución Española : Thursday, 6 December, 2007 
10. Día de Navidad : Tuesday, 25 December, 2007 
And here are the 3 public holidays falling on a weekend:
1. Epifanía del Señor : Saturday, 6 January, 2007 
2. Nuestra Señora de África : Sunday, 5 August, 2007 
3. Immaculada Concepcíon : Saturday, 8 December, 2007