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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. Makar Sankranti : среда, 14 январь, 1970
3. Republic Day : понедельник, 26 январь, 1970
4. Maharaja Shivaji Jayanti : четверг, 19 февраль, 1970
5. Good Friday : пятница, 27 март, 1970
6. Mesadi : вторник, 14 апрель, 1970
7. Mahatma Gandhi's Birthday : пятница, 2 октябрь, 1970
8. Christmas Eve : четверг, 24 декабрь, 1970
9. Christmas : пятница, 25 декабрь, 1970

And here is the public holiday falling on a weekend:

1. Independence Day : суббота, 15 август, 1970