Define a period

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How many working days in year 1920?

Here is the detail of the calculation:

Because 1920 is a leap year, it has 366 days.

Let's remove 52 saturdays and 52 sundays. It remains 262 days.

Now, let's remove 10 public holidays that do not fall during a weekend and we obtain 252 working days in 1920.

Here is the list of these 10 public holidays:

1. Jour de l'An : Thursday, 1 January, 1920
2. Jour de la Sainte Dévote : Tuesday, 27 January, 1920
3. Lundi de Pâques : Monday, 5 April, 1920
4. Jeudi de l'Ascension : Thursday, 13 May, 1920
5. Lundi de la Pentecôte : Monday, 24 May, 1920
6. Jour de la fête Dieu : Thursday, 3 June, 1920
7. Fête de l'Assomption : Monday, 16 August, 1920
8. Fête de la Toussaint : Monday, 1 November, 1920
9. Fête Nationale : Friday, 19 November, 1920
10. Fête de l'Immaculée Conception : Wednesday, 8 December, 1920

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

1. Fête du Travail : Saturday, 1 May, 1920
2. Fête de l'Assomption : Sunday, 15 August, 1920
3. Jour de Noël : Saturday, 25 December, 1920