Define a period

...

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. Jour de l'An : Wednesday, 1 January, 1997
2. Jour de la Sainte Dévote : Monday, 27 January, 1997
3. Lundi de Pâques : Monday, 31 March, 1997
4. Fête du Travail : Thursday, 1 May, 1997
5. Jeudi de l'Ascension : Thursday, 8 May, 1997
6. Lundi de la Pentecôte : Monday, 19 May, 1997
7. Jour de la fête Dieu : Thursday, 29 May, 1997
8. Fête de l'Assomption : Friday, 15 August, 1997
9. Fête Nationale : Wednesday, 19 November, 1997
10. Fête de l'Immaculée Conception : Monday, 8 December, 1997
11. Jour de Noël : Thursday, 25 December, 1997

And here is the public holiday falling on a weekend:

1. Fête de la Toussaint : Saturday, 1 November, 1997