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How many working days in year 2038?
Here is the detail of the calculation:
Because 2038 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 8 public holidays that do not fall during a weekend and we obtain 253 working days in 2038.
 Here is the list of these 8 public holidays: 
 
 1. Solenidade da Santa Mãe de Deus : Friday, 1 January, 2038 
2. Sexta-Feira Santa : Friday, 23 April, 2038 
3. Dia de Portugal, de Camões e das Comunidades Portuguesas : Thursday, 10 June, 2038 
4. Corpo de Deus : Thursday, 24 June, 2038 
5. Implantação da República : Tuesday, 5 October, 2038 
6. Todos os Santos : Monday, 1 November, 2038 
7. Restauração da Independência : Wednesday, 1 December, 2038 
8. Dia da Imaculada Conceição : Wednesday, 8 December, 2038 
And here are the 4 public holidays falling on a weekend:
1. Páscoa : Sunday, 25 April, 2038 
2. Dia do Trabalhador : Saturday, 1 May, 2038 
3. Assunção de Nossa Senhora : Sunday, 15 August, 2038 
4. Natal : Saturday, 25 December, 2038