Определить период

...

How many working days in year 2017?

Here is the detail of the calculation:

Because 2017 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 4 public holidays that do not fall during a weekend and we obtain 256 working days in 2017.

Here is the list of these 4 public holidays:

1. Good Friday : пятница, 14 апрель, 2017
2. Labour Day : понедельник, 1 май, 2017
3. National Day : среда, 9 август, 2017
4. Christmas Day : понедельник, 25 декабрь, 2017

And here is the public holiday falling on a weekend:

1. New Year's Day : воскресенье, 1 январь, 2017