Define a period

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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 11 public holidays that do not fall during a weekend and we obtain 250 working days in 1997.

Here is the list of these 11 public holidays:

1. Año Nuevo : Wednesday, 1 January, 1997
2. Viernes Santo : Friday, 28 March, 1997
3. Día Internacional de los Trabajadores : Thursday, 1 May, 1997
4. Día de las Glorias Navales : Wednesday, 21 May, 1997
5. Virgen del Carmen : Wednesday, 16 July, 1997
6. Asunción de la Virgen : Friday, 15 August, 1997
7. Fiestas Patrias : Thursday, 18 September, 1997
8. Día de las Glorias del Ejércitos : Friday, 19 September, 1997
9. Día Nacional de las Iglesias Evangélicas y Protestantes : Friday, 31 October, 1997
10. Día de la Inmaculada Concepción : Monday, 8 December, 1997
11. Navidad : Thursday, 25 December, 1997

And here are the 4 public holidays falling on a weekend:

1. Sábado Santo : Saturday, 29 March, 1997
2. San Pedro y San Pablo : Sunday, 29 June, 1997
3. Día del Descubrimiento de Dos Mundos : Sunday, 12 October, 1997
4. Día de Todos los Santos : Saturday, 1 November, 1997