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How many working days in year 1965?

Here is the detail of the calculation:

Because 1965 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 1965.

Here is the list of these 9 public holidays:

1. Restoration Day of the Independent Czech State : пятница, 1 январь, 1965
2. Good Friday : пятница, 16 апрель, 1965
3. Easter Monday : понедельник, 19 апрель, 1965
4. St Cyril and Methodius' Day : понедельник, 5 июль, 1965
5. Jan Hus Day : вторник, 6 июль, 1965
6. St Wenceslas Day : вторник, 28 сентябрь, 1965
7. Independence Day : четверг, 28 октябрь, 1965
8. Freedom and Democracy Day : среда, 17 ноябрь, 1965
9. Christmas Eve : пятница, 24 декабрь, 1965

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

1. Labour Day : суббота, 1 май, 1965
2. Liberation Day : суббота, 8 май, 1965
3. Christmas Day : суббота, 25 декабрь, 1965
4. St. Stephen's Day : воскресенье, 26 декабрь, 1965