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How many working days in year 2028?
Here is the detail of the calculation:
Because 2028 is a leap year, it has 366 days.
Let's remove 53 saturdays and 53 sundays. It remains 260 days.
Now, let's remove 11 public holidays that do not fall during a weekend and we obtain 249 working days in 2028.
 Here is the list of these 11 public holidays: 
 
 1. Sexta-Feira Santa : п'ятниця, 14 квітень, 2028 
2. Dia da Liberdade : вівторок, 25 квітень, 2028 
3. Dia do Trabalhador : понеділок, 1 травень, 2028 
4. Dia dos Açores : понеділок, 5 червень, 2028 
5. Corpo de Deus : четвер, 15 червень, 2028 
6. Assunção de Nossa Senhora : вівторок, 15 серпень, 2028 
7. Implantação da República : четвер, 5 жовтень, 2028 
8. Todos os Santos : середа, 1 листопад, 2028 
9. Restauração da Independência : п'ятниця, 1 грудень, 2028 
10. Dia da Imaculada Conceição : п'ятниця, 8 грудень, 2028 
11. Natal : понеділок, 25 грудень, 2028 
And here are the 3 public holidays falling on a weekend:
1. Solenidade da Santa Mãe de Deus : субота, 1 січень, 2028 
2. Páscoa : неділя, 16 квітень, 2028 
3. Dia de Portugal, de Camões e das Comunidades Portuguesas : субота, 10 червень, 2028