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How many working days in year 1997?
Here is the detail of the calculation:
Because 1997 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 17 public holidays that do not fall during a weekend and we obtain 244 working days in 1997.
 Here is the list of these 17 public holidays: 
 
 1. Año Nuevo : Wednesday, 1 January, 1997 
2. Día de los Reyes Magos : Monday, 6 January, 1997 
3. Día de San José : Monday, 24 March, 1997 
4. Jueves Santo : Thursday, 27 March, 1997 
5. Viernes Santo : Friday, 28 March, 1997 
6. Primero de Mayo : Thursday, 1 May, 1997 
7. La Ascensión del Señor : Monday, 12 May, 1997 
8. Corpus Christi : Monday, 2 June, 1997 
9. El Sagrado Corazón de Jesús : Monday, 9 June, 1997 
10. San Pedro y San Pablo : Monday, 30 June, 1997 
11. Batalla de Boyaca : Thursday, 7 August, 1997 
12. La Asunción de la Virgen : Monday, 18 August, 1997 
13. Día de la Raza : Monday, 13 October, 1997 
14. Día de Todos los Santos : Monday, 3 November, 1997 
15. Independencia de Cartagena : Monday, 17 November, 1997 
16. Día de la Inmaculada Concepción : Monday, 8 December, 1997 
17. Navidad : Thursday, 25 December, 1997 
And here are the 2 public holidays falling on a weekend:
1. Domingo de Pascua : Sunday, 30 March, 1997 
2. Grito de Independencia : Sunday, 20 July, 1997