Define a period

...

How many working days in year 1986?

Here is the detail of the calculation:

Because 1986 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 10 public holidays that do not fall during a weekend and we obtain 251 working days in 1986.

Here is the list of these 10 public holidays:

1. Año Nuevo : Wednesday, 1 January, 1986
2. Jueves Santo : Thursday, 27 March, 1986
3. Viernes Santo : Friday, 28 March, 1986
4. Día del Trabajo : Thursday, 1 May, 1986
5. Día del Ejército : Monday, 30 June, 1986
6. Día de la Independencia : Monday, 15 September, 1986
7. Día de la Revolución : Monday, 20 October, 1986
8. Noche Buena : Wednesday, 24 December, 1986
9. Navidad : Thursday, 25 December, 1986
10. Víspera de Año Nuevo : Wednesday, 31 December, 1986

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

1. Sábado Santo : Saturday, 29 March, 1986
2. Día de Todos los Santos : Saturday, 1 November, 1986