Определить период

...

How many working days in year 1972?

Here is the detail of the calculation:

Because 1972 is a leap year, it has 366 days.

Let's remove 53 saturdays and 53 sundays. It remains 260 days.

Now, let's remove 6 public holidays that do not fall during a weekend and we obtain 254 working days in 1972.

Here is the list of these 6 public holidays:

1. Indépendance : среда, 1 март, 1972
2. Vendredi Saint : пятница, 31 март, 1972
3. Fête du Travail : понедельник, 1 май, 1972
4. Jeudi de l'Ascension : четверг, 11 май, 1972
5. Fête nationale suisse : вторник, 1 август, 1972
6. Noël : понедельник, 25 декабрь, 1972

And here is the public holiday falling on a weekend:

1. Jour de l'An : суббота, 1 январь, 1972