Определить период

...

How many working days in year 1970?

Here is the detail of the calculation:

Because 1970 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 8 public holidays that do not fall during a weekend and we obtain 253 working days in 1970.

Here is the list of these 8 public holidays:

1. Jour de l'An : четверг, 1 январь, 1970
2. Lundi de Pâques : понедельник, 30 март, 1970
3. Fête du Travail : пятница, 1 май, 1970
4. Jeudi de l'Ascension : четверг, 7 май, 1970
5. Lundi de la Pentecôte : понедельник, 18 май, 1970
6. Fête Nationale : вторник, 21 июль, 1970
7. Fête de l'Armistice : среда, 11 ноябрь, 1970
8. Noël : пятница, 25 декабрь, 1970

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

1. Assomption : суббота, 15 август, 1970
2. Toussaint : воскресенье, 1 ноябрь, 1970
3. Fête du Roi : воскресенье, 15 ноябрь, 1970