Определить период

...

How many working days in year 2015?

Here is the detail of the calculation:

Because 2015 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 11 public holidays that do not fall during a weekend and we obtain 250 working days in 2015.

Here is the list of these 11 public holidays:

1. New Year's Day : четверг, январь 1, 2015
2. Martin Luther King Day : понедельник, январь 19, 2015
3. Good Friday : пятница, апрель 3, 2015
4. Memorial Day : понедельник, май 25, 2015
5. Juneteenth National Independence Day : пятница, июнь 19, 2015
6. Independence Day (observance) : пятница, июль 3, 2015
7. Labor Day : понедельник, сентябрь 7, 2015
8. Veterans Day : среда, ноябрь 11, 2015
9. Thanksgiving : четверг, ноябрь 26, 2015
10. Christmas Eve : четверг, декабрь 24, 2015
11. Christmas : пятница, декабрь 25, 2015

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

1. Independence Day : суббота, июль 4, 2015
2. December 26 : суббота, декабрь 26, 2015