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. Seollal / Korean New Year Holiday : пятница, 31 январь, 1919
3. Independence Movement Day : понедельник, 3 март, 1919
4. Children's Day : понедельник, 5 май, 1919
5. Buddha's Birthday : среда, 7 май, 1919
6. Memorial Day : пятница, 6 июнь, 1919
7. Liberation Day : пятница, 15 август, 1919
8. National Foundation Day : пятница, 3 октябрь, 1919
9. Chuseok / Midautumn Festival : вторник, 7 октябрь, 1919
10. Chuseok / Midautumn Festival : среда, 8 октябрь, 1919
11. Chuseok / Midautumn Festival : четверг, 9 октябрь, 1919
12. Christmas Day : четверг, 25 декабрь, 1919

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

1. Seollal / Korean New Year Holiday : суббота, 1 февраль, 1919
2. Seollal / Korean New Year Holiday : воскресенье, 2 февраль, 1919
3. Independence Movement Day : суббота, 1 март, 1919