Определить период

...

How many working days in year 1983?

Here is the detail of the calculation:

Because 1983 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 1983.

Here is the list of these 7 public holidays:

1. Orthodox Christmas Day : пятница, 7 январь, 1983
2. National Day : вторник, 15 февраль, 1983
3. National Day Holiday : среда, 16 февраль, 1983
4. May Day Holiday : понедельник, 2 май, 1983
5. Great Friday : пятница, 6 май, 1983
6. Easter Monday : понедельник, 9 май, 1983
7. Armistice Day : пятница, 11 ноябрь, 1983

And here are the 5 public holidays falling on a weekend:

1. New Year's Day : суббота, 1 январь, 1983
2. New Year's Holiday : воскресенье, 2 январь, 1983
3. May Day : воскресенье, 1 май, 1983
4. Orthodox Easter Saturday : суббота, 7 май, 1983
5. Easter : воскресенье, 8 май, 1983