Определить период

...

How many working days in year 1964?

Here is the detail of the calculation:

Because 1964 is a leap year, it has 366 days.

Let's remove 52 saturdays and 52 sundays. It remains 262 days.

Now, let's remove 5 public holidays that do not fall during a weekend and we obtain 257 working days in 1964.

Here is the list of these 5 public holidays:

1. New Year's Day : среда, 1 январь, 1964
2. Good Friday : пятница, 27 март, 1964
3. Labour Day : пятница, 1 май, 1964
4. National Day : понедельник, 10 август, 1964
5. Christmas Day : пятница, 25 декабрь, 1964

And here is the public holiday falling on a weekend:

1. National Day : воскресенье, 9 август, 1964