Define a period

...

How many working days in year 1985?

Here is the detail of the calculation:

Because 1985 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 1985.

Here is the list of these 10 public holidays:

1. Solenidade da Santa Mãe de Deus : Tuesday, 1 January, 1985
2. Sexta-Feira Santa : Friday, 5 April, 1985
3. Dia da Liberdade : Thursday, 25 April, 1985
4. Dia do Trabalhador : Wednesday, 1 May, 1985
5. Dia dos Açores : Monday, 27 May, 1985
6. Corpo de Deus : Thursday, 6 June, 1985
7. Dia de Portugal : Monday, 10 June, 1985
8. Assunção de Nossa Senhora : Thursday, 15 August, 1985
9. Todos os Santos : Friday, 1 November, 1985
10. Natal : Wednesday, 25 December, 1985

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

1. Páscoa : Sunday, 7 April, 1985
2. Implantação da República : Saturday, 5 October, 1985
3. Restauração da Independência : Sunday, 1 December, 1985
4. Dia da Imaculada Conceição : Sunday, 8 December, 1985