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How many working days in year 1970?

Here is the detail of the calculation:

Because 1970 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 1970.

Here is the list of these 9 public holidays:

1. New Year's Day : четверг, 1 январь, 1970
2. Good Friday : пятница, 27 март, 1970
3. Easter Monday : понедельник, 30 март, 1970
4. National Patriots' Day : понедельник, 18 май, 1970
5. National Holiday of Quebec : среда, 24 июнь, 1970
6. Canada Day : среда, 1 июль, 1970
7. Labour Day : понедельник, 7 сентябрь, 1970
8. Thanksgiving : понедельник, 12 октябрь, 1970
9. Christmas : пятница, 25 декабрь, 1970