Define a period

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How many working days in year 2100?

Here is the detail of the calculation:

Because 2100 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 2100.

Here is the list of these 10 public holidays:

1. Jour de l'An : Friday, 1 January, 2100
2. Jour de la Sainte Dévote : Wednesday, 27 January, 2100
3. Lundi de Pâques : Monday, 29 March, 2100
4. Jeudi de l'Ascension : Thursday, 6 May, 2100
5. Lundi de la Pentecôte : Monday, 17 May, 2100
6. Jour de la fête Dieu : Thursday, 27 May, 2100
7. Fête de l'Assomption : Monday, 16 August, 2100
8. Fête de la Toussaint : Monday, 1 November, 2100
9. Fête Nationale : Friday, 19 November, 2100
10. Fête de l'Immaculée Conception : Wednesday, 8 December, 2100

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

1. Fête du Travail : Saturday, 1 May, 2100
2. Fête de l'Assomption : Sunday, 15 August, 2100
3. Jour de Noël : Saturday, 25 December, 2100