Define a period

...

How many working days in year 1990?

Here is the detail of the calculation:

Because 1990 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 1990.

Here is the list of these 17 public holidays:

1. Año Nuevo : Monday, 1 January, 1990
2. Día de los Reyes Magos : Monday, 8 January, 1990
3. Día de San José : Monday, 19 March, 1990
4. Jueves Santo : Thursday, 12 April, 1990
5. Viernes Santo : Friday, 13 April, 1990
6. Primero de Mayo : Tuesday, 1 May, 1990
7. La Ascensión del Señor : Monday, 28 May, 1990
8. Corpus Christi : Monday, 18 June, 1990
9. El Sagrado Corazón de Jesús : Monday, 25 June, 1990
10. San Pedro y San Pablo : Monday, 2 July, 1990
11. Grito de Independencia : Friday, 20 July, 1990
12. Batalla de Boyaca : Tuesday, 7 August, 1990
13. La Asunción de la Virgen : Monday, 20 August, 1990
14. Día de la Raza : Monday, 15 October, 1990
15. Día de Todos los Santos : Monday, 5 November, 1990
16. Independencia de Cartagena : Monday, 12 November, 1990
17. Navidad : Tuesday, 25 December, 1990

And here are the 2 public holidays falling on a weekend:

1. Domingo de Pascua : Sunday, 15 April, 1990
2. Día de la Inmaculada Concepción : Saturday, 8 December, 1990