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How many working days in year 2004?
Here is the detail of the calculation:
Because 2004 is a leap year, it has 366 days.
Let's remove 52 saturdays and 52 sundays. It remains 262 days.
Now, let's remove 9 public holidays that do not fall during a weekend and we obtain 253 working days in 2004.
 Here is the list of these 9 public holidays: 
 
 1. Año Nuevo : Thursday, 1 January, 2004 
2. Epifanía del Señor : Tuesday, 6 January, 2004 
3. Jueves santo : Thursday, 8 April, 2004 
4. Viernes Santo : Friday, 9 April, 2004 
5. Lunes de Pascua : Monday, 12 April, 2004 
6. Fiesta nacional de España : Tuesday, 12 October, 2004 
7. Todos los Santos : Monday, 1 November, 2004 
8. Día de la Constitución Española : Monday, 6 December, 2004 
9. Immaculada Concepcíon : Wednesday, 8 December, 2004 
And here are the 4 public holidays falling on a weekend:
1. Fiesta del Trabajo : Saturday, 1 May, 2004 
2. Santiago Apóstol : Sunday, 25 July, 2004 
3. Asuncíon de la Virgen : Sunday, 15 August, 2004 
4. Día de Navidad : Saturday, 25 December, 2004