Определить период

...

How many working days in year 1989?

Here is the detail of the calculation:

Because 1989 is not a leap year, it has 365 days.

Let's remove 52 saturdays and 53 sundays. It remains 260 days.

Now, let's remove 8 public holidays that do not fall during a weekend and we obtain 252 working days in 1989.

Here is the list of these 8 public holidays:

1. Lundi de Pâques : понедельник, 27 март, 1989
2. Fête du Travail : понедельник, 1 май, 1989
3. Jeudi de l'Ascension : четверг, 4 май, 1989
4. Lundi de la Pentecôte : понедельник, 15 май, 1989
5. Fête Nationale : пятница, 21 июль, 1989
6. Assomption : вторник, 15 август, 1989
7. Toussaint : среда, 1 ноябрь, 1989
8. Noël : понедельник, 25 декабрь, 1989

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

1. Jour de l'An : воскресенье, 1 январь, 1989
2. Fête de l'Armistice : суббота, 11 ноябрь, 1989