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How many working days in year 1988?

Here is the detail of the calculation:

Because 1988 is a leap year, it has 366 days.

Let's remove 53 saturdays and 52 sundays. It remains 261 days.

Now, let's remove 9 public holidays that do not fall during a weekend and we obtain 252 working days in 1988.

Here is the list of these 9 public holidays:

1. Confraternização Universal : пятница, 1 январь, 1988
2. Terça-feira de Carnaval : вторник, 16 февраль, 1988
3. Sexta Feira Santa ou Paixão de Cristo : пятница, 1 апрель, 1988
4. Tiradentes : четверг, 21 апрель, 1988
5. Corpus Christi : четверг, 2 июнь, 1988
6. Independência do Brasil : среда, 7 сентябрь, 1988
7. Nossa Senhora Aparecida : среда, 12 октябрь, 1988
8. Finados : среда, 2 ноябрь, 1988
9. Proclamação da República Brasileira : вторник, 15 ноябрь, 1988

And here are the 3 public holidays falling on a weekend:

1. Dia do Trabalho : воскресенье, 1 май, 1988
2. Independência da Bahia : суббота, 2 июль, 1988
3. Natal : воскресенье, 25 декабрь, 1988