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How many working days in year 2013?
Here is the detail of the calculation:
Because 2013 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 2013.
 Here is the list of these 10 public holidays: 
 
 1. Solenidade da Santa Mãe de Deus : вівторок, 1 січень, 2013 
2. Dia de São José : вівторок, 19 березень, 2013 
3. Sexta-Feira Santa : п'ятниця, 29 березень, 2013 
4. Dia da Liberdade : четвер, 25 квітень, 2013 
5. Dia do Trabalhador : середа, 1 травень, 2013 
6. Corpo de Deus : четвер, 30 травень, 2013 
7. Dia de Portugal, de Camões e das Comunidades Portuguesas : понеділок, 10 червень, 2013 
8. Assunção de Nossa Senhora : четвер, 15 серпень, 2013 
9. Todos os Santos : п'ятниця, 1 листопад, 2013 
10. Natal : середа, 25 грудень, 2013 
And here are the 4 public holidays falling on a weekend:
1. Páscoa : неділя, 31 березень, 2013 
2. Implantação da República : субота, 5 жовтень, 2013 
3. Restauração da Independência : неділя, 1 грудень, 2013 
4. Dia da Imaculada Conceição : неділя, 8 грудень, 2013