Определить период

...

How many working days in year 1990?

Here is the detail of the calculation:

Because 1990 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 1990.

Here is the list of these 8 public holidays:

1. Capodanno : понедельник, 1 январь, 1990
2. Lunedì di Pasqua : понедельник, 16 апрель, 1990
3. Anniversario Liberazione : среда, 25 апрель, 1990
4. Festa del lavoro : вторник, 1 май, 1990
5. Ferragosto o Assunzione : среда, 15 август, 1990
6. Ognissanti o Tutti i Santi : четверг, 1 ноябрь, 1990
7. Santo Natale : вторник, 25 декабрь, 1990
8. Santo Stefano : среда, 26 декабрь, 1990

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

1. Epifania : суббота, 6 январь, 1990
2. Festa della Repubblica Italia : суббота, 2 июнь, 1990
3. Immacolata Concezione : суббота, 8 декабрь, 1990