Define a period

...

How many working days in year 1945?

Here is the detail of the calculation:

Because 1945 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 1945.

Here is the list of these 10 public holidays:

1. Jour de l'An : Monday, 1 January, 1945
2. Lundi de Pâques : Monday, 2 April, 1945
3. Fête du Travail : Tuesday, 1 May, 1945
4. Jeudi de l'Ascension : Thursday, 10 May, 1945
5. Lundi de la Pentecôte : Monday, 21 May, 1945
6. Jour de la fête Dieu : Thursday, 31 May, 1945
7. Fête de l'Assomption : Wednesday, 15 August, 1945
8. Fête de la Toussaint : Thursday, 1 November, 1945
9. Fête Nationale : Monday, 19 November, 1945
10. Jour de Noël : Tuesday, 25 December, 1945

And here are the 2 public holidays falling on a weekend:

1. Jour de la Sainte Dévote : Saturday, 27 January, 1945
2. Fête de l'Immaculée Conception : Saturday, 8 December, 1945