Define a period

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How many working days in year 1977?

Here is the detail of the calculation:

Because 1977 is not a leap year, it has 365 days.

Let's remove 53 saturdays and 52 sundays. It remains 260 days.

Now, let's remove 10 public holidays that do not fall during a weekend and we obtain 250 working days in 1977.

Here is the list of these 10 public holidays:

1. Jour de la Sainte Dévote : Thursday, 27 January, 1977
2. Lundi de Pâques : Monday, 11 April, 1977
3. Fête du Travail : Monday, 2 May, 1977
4. Jeudi de l'Ascension : Thursday, 19 May, 1977
5. Lundi de la Pentecôte : Monday, 30 May, 1977
6. Jour de la fête Dieu : Thursday, 9 June, 1977
7. Fête de l'Assomption : Monday, 15 August, 1977
8. Fête de la Toussaint : Tuesday, 1 November, 1977
9. Fête de l'Immaculée Conception : Thursday, 8 December, 1977
10. Jour de Noël : Monday, 26 December, 1977

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

1. Jour de l'An : Saturday, 1 January, 1977
2. Fête du Travail : Sunday, 1 May, 1977
3. Fête Nationale : Saturday, 19 November, 1977
4. Jour de Noël : Sunday, 25 December, 1977