Define a period

...

How many working days in year 2011?

Here is the detail of the calculation:

Because 2011 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 2011.

Here is the list of these 9 public holidays:

1. Sexta-Feira Santa : Friday, 22 April, 2011
2. Dia da Liberdade : Monday, 25 April, 2011
3. Dia de Portugal : Friday, 10 June, 2011
4. Corpo de Deus : Thursday, 23 June, 2011
5. Assunção de Nossa Senhora : Monday, 15 August, 2011
6. Implantação da República : Wednesday, 5 October, 2011
7. Todos os Santos : Tuesday, 1 November, 2011
8. Restauração da Independência : Thursday, 1 December, 2011
9. Dia da Imaculada Conceição : Thursday, 8 December, 2011

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

1. Solenidade da Santa Mãe de Deus : Saturday, 1 January, 2011
2. Páscoa : Sunday, 24 April, 2011
3. Dia do Trabalhador : Sunday, 1 May, 2011
4. Natal : Sunday, 25 December, 2011