Определить период

...

How many working days in year 1921?

Here is the detail of the calculation:

Because 1921 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 7 public holidays that do not fall during a weekend and we obtain 253 working days in 1921.

Here is the list of these 7 public holidays:

1. Vendredi Saint : пятница, 25 март, 1921
2. Lundi de Pâques : понедельник, 28 март, 1921
3. Jeudi de l'Ascension : четверг, 5 май, 1921
4. Lundi de la Pentecôte : понедельник, 16 май, 1921
5. Fête-Dieu : четверг, 26 май, 1921
6. Fête nationale suisse : понедельник, 1 август, 1921
7. Saint Étienne : понедельник, 26 декабрь, 1921

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

1. Jour de l'An : суббота, 1 январь, 1921
2. Noël : воскресенье, 25 декабрь, 1921