Определить период

...

How many working days in year 1920?

Here is the detail of the calculation:

Because 1920 is a leap year, it has 366 days.

Let's remove 52 saturdays and 52 sundays. It remains 262 days.

Now, let's remove 8 public holidays that do not fall during a weekend and we obtain 254 working days in 1920.

Here is the list of these 8 public holidays:

1. Solenidade da Santa Mãe de Deus : четверг, 1 январь, 1920
2. Sexta-Feira Santa : пятница, 2 апрель, 1920
3. Corpo de Deus : четверг, 3 июнь, 1920
4. Dia de Portugal : четверг, 10 июнь, 1920
5. Implantação da República : вторник, 5 октябрь, 1920
6. Todos os Santos : понедельник, 1 ноябрь, 1920
7. Restauração da Independência : среда, 1 декабрь, 1920
8. Dia da Imaculada Conceição : среда, 8 декабрь, 1920

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

1. Páscoa : воскресенье, 4 апрель, 1920
2. Dia da Liberdade : воскресенье, 25 апрель, 1920
3. Dia do Trabalhador : суббота, 1 май, 1920
4. Assunção de Nossa Senhora : воскресенье, 15 август, 1920
5. Natal : суббота, 25 декабрь, 1920