Define a period

...

How many working days in year 1960?

Here is the detail of the calculation:

Because 1960 is a leap year, it has 366 days.

Let's remove 53 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 1960.

Here is the list of these 11 public holidays:

1. Jour de l'An : Friday, 1 January, 1960
2. Jour de la Sainte Dévote : Wednesday, 27 January, 1960
3. Lundi de Pâques : Monday, 18 April, 1960
4. Fête du Travail : Monday, 2 May, 1960
5. Jeudi de l'Ascension : Thursday, 26 May, 1960
6. Lundi de la Pentecôte : Monday, 6 June, 1960
7. Jour de la fête Dieu : Thursday, 16 June, 1960
8. Fête de l'Assomption : Monday, 15 August, 1960
9. Fête de la Toussaint : Tuesday, 1 November, 1960
10. Fête de l'Immaculée Conception : Thursday, 8 December, 1960
11. Jour de Noël : Monday, 26 December, 1960

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

1. Fête du Travail : Sunday, 1 May, 1960
2. Fête Nationale : Saturday, 19 November, 1960
3. Jour de Noël : Sunday, 25 December, 1960