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 8 public holidays that do not fall during a weekend and we obtain 253 working days in 1997.

Here is the list of these 8 public holidays:

1. Año Nuevo : Wednesday, 1 January, 1997
2. Día de la Constitución : Monday, 3 February, 1997
3. Natalicio de Benito Juárez : Monday, 17 March, 1997
4. Viernes Santo : Friday, 28 March, 1997
5. Día del Trabajo : Thursday, 1 May, 1997
6. Día de la Independencia : Tuesday, 16 September, 1997
7. Día de la Revolución : Monday, 17 November, 1997
8. Navidad : Thursday, 25 December, 1997