Определить период

...

How many working days in year 1999?

Here is the detail of the calculation:

Because 1999 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 1999.

Here is the list of these 12 public holidays:

1. Confraternização Universal : пятница, 1 январь, 1999
2. Terça-feira de Carnaval : вторник, 16 февраль, 1999
3. Dia de São José : пятница, 19 март, 1999
4. Data magna do estado Ceará : четверг, 25 март, 1999
5. Sexta Feira Santa ou Paixão de Cristo : пятница, 2 апрель, 1999
6. Tiradentes : среда, 21 апрель, 1999
7. Corpus Christi : четверг, 3 июнь, 1999
8. Independência do Brasil : вторник, 7 сентябрь, 1999
9. Criação do Território Federal : понедельник, 13 сентябрь, 1999
10. Nossa Senhora Aparecida : вторник, 12 октябрь, 1999
11. Finados : вторник, 2 ноябрь, 1999
12. Proclamação da República Brasileira : понедельник, 15 ноябрь, 1999

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

1. Dia do Trabalho : суббота, 1 май, 1999
2. Natal : суббота, 25 декабрь, 1999