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How many working days in year 1966?

Here is the detail of the calculation:

Because 1966 is not a leap year, it has 365 days.

Let's remove 53 saturdays and 52 sundays. It remains 260 days.

Now, let's remove 9 public holidays that do not fall during a weekend and we obtain 251 working days in 1966.

Here is the list of these 9 public holidays:

1. Dia de São Sebastião : четверг, 20 январь, 1966
2. Terça-feira de Carnaval : вторник, 22 февраль, 1966
3. Sexta Feira Santa ou Paixão de Cristo : пятница, 8 апрель, 1966
4. Tiradentes : четверг, 21 апрель, 1966
5. Corpus Christi : четверг, 9 июнь, 1966
6. Independência do Brasil : среда, 7 сентябрь, 1966
7. Nossa Senhora Aparecida : среда, 12 октябрь, 1966
8. Finados : среда, 2 ноябрь, 1966
9. Proclamação da República Brasileira : вторник, 15 ноябрь, 1966

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

1. Confraternização Universal : суббота, 1 январь, 1966
2. Dia de São Jorge : суббота, 23 апрель, 1966
3. Dia do Trabalho : воскресенье, 1 май, 1966
4. Natal : воскресенье, 25 декабрь, 1966