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How many working days in year 1971?

Here is the detail of the calculation:

Because 1971 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 9 public holidays that do not fall during a weekend and we obtain 252 working days in 1971.

Here is the list of these 9 public holidays:

1. Restoration Day of the Independent Czech State : пятница, 1 январь, 1971
2. Good Friday : пятница, 9 апрель, 1971
3. Easter Monday : понедельник, 12 апрель, 1971
4. St Cyril and Methodius' Day : понедельник, 5 июль, 1971
5. Jan Hus Day : вторник, 6 июль, 1971
6. St Wenceslas Day : вторник, 28 сентябрь, 1971
7. Independence Day : четверг, 28 октябрь, 1971
8. Freedom and Democracy Day : среда, 17 ноябрь, 1971
9. Christmas Eve : пятница, 24 декабрь, 1971

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

1. Labour Day : суббота, 1 май, 1971
2. Liberation Day : суббота, 8 май, 1971
3. Christmas Day : суббота, 25 декабрь, 1971
4. St. Stephen's Day : воскресенье, 26 декабрь, 1971