Определить период

...

How many working days in year 2009?

Here is the detail of the calculation:

Because 2009 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 9 public holidays that do not fall during a weekend and we obtain 252 working days in 2009.

Here is the list of these 9 public holidays:

1. Solenidade da Santa Mãe de Deus : четверг, 1 январь, 2009
2. Sexta-Feira Santa : пятница, 10 апрель, 2009
3. Dia do Trabalhador : пятница, 1 май, 2009
4. Dia de Portugal : среда, 10 июнь, 2009
5. Corpo de Deus : четверг, 11 июнь, 2009
6. Implantação da República : понедельник, 5 октябрь, 2009
7. Restauração da Independência : вторник, 1 декабрь, 2009
8. Dia da Imaculada Conceição : вторник, 8 декабрь, 2009
9. Natal : пятница, 25 декабрь, 2009

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

1. Páscoa : воскресенье, 12 апрель, 2009
2. Dia da Liberdade : суббота, 25 апрель, 2009
3. Assunção de Nossa Senhora : суббота, 15 август, 2009
4. Todos os Santos : воскресенье, 1 ноябрь, 2009