Define a period

...

How many working days in year 1930?

Here is the detail of the calculation:

Because 1930 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 10 public holidays that do not fall during a weekend and we obtain 251 working days in 1930.

Here is the list of these 10 public holidays:

1. Solenidade da Santa Mãe de Deus : Wednesday, 1 January, 1930
2. Sexta-Feira Santa : Friday, 18 April, 1930
3. Dia da Liberdade : Friday, 25 April, 1930
4. Dia do Trabalhador : Thursday, 1 May, 1930
5. Dia de Portugal : Tuesday, 10 June, 1930
6. Corpo de Deus : Thursday, 19 June, 1930
7. Assunção de Nossa Senhora : Friday, 15 August, 1930
8. Restauração da Independência : Monday, 1 December, 1930
9. Dia da Imaculada Conceição : Monday, 8 December, 1930
10. Natal : Thursday, 25 December, 1930

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

1. Páscoa : Sunday, 20 April, 1930
2. Implantação da República : Sunday, 5 October, 1930
3. Todos os Santos : Saturday, 1 November, 1930