Define a period

...

How many working days in year 2091?

Here is the detail of the calculation:

Because 2091 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 9 public holidays that do not fall during a weekend and we obtain 252 working days in 2091.

Here is the list of these 9 public holidays:

1. Año Nuevo : Monday, 1 January, 2091
2. Jueves Santo : Thursday, 5 April, 2091
3. Viernes Santo : Friday, 6 April, 2091
4. Día del Trabajo : Tuesday, 1 May, 2091
5. Día del Ejército : Monday, 2 July, 2091
6. Día de Todos los Santos : Thursday, 1 November, 2091
7. Noche Buena : Monday, 24 December, 2091
8. Navidad : Tuesday, 25 December, 2091
9. Víspera de Año Nuevo : Monday, 31 December, 2091

And here are the 3 public holidays falling on a weekend:

1. Sábado Santo : Saturday, 7 April, 2091
2. Día de la Independencia : Saturday, 15 September, 2091
3. Día de la Revolución : Saturday, 20 October, 2091