Определить период

...

How many working days in year 1919?

Here is the detail of the calculation:

Because 1919 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 12 public holidays that do not fall during a weekend and we obtain 249 working days in 1919.

Here is the list of these 12 public holidays:

1. New Year's Day : среда, 1 январь, 1919
2. National day : понедельник, 3 март, 1919
3. Orthodox Easter Friday : пятница, 18 апрель, 1919
4. Orthodox Easter Monday : понедельник, 21 апрель, 1919
5. Labour Day : четверг, 1 май, 1919
6. St. George's Day : вторник, 6 май, 1919
7. Culture and Literacy Day (observance) : понедельник, 26 май, 1919
8. Unification Day (observance) : понедельник, 8 сентябрь, 1919
9. Independence Day : понедельник, 22 сентябрь, 1919
10. Christmas Eve : среда, 24 декабрь, 1919
11. Christmas Day : четверг, 25 декабрь, 1919
12. Boxing day : пятница, 26 декабрь, 1919

And here are the 4 public holidays falling on a weekend:

1. Orthodox Easter Saturday : суббота, 19 апрель, 1919
2. Orthodox Easter Sunday : воскресенье, 20 апрель, 1919
3. Culture and Literacy Day : суббота, 24 май, 1919
4. Unification Day : суббота, 6 сентябрь, 1919