Определить период

...

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 6 public holidays that do not fall during a weekend and we obtain 255 working days in 1965.

Here is the list of these 6 public holidays:

1. New Year's Day : пятница, 1 январь, 1965
2. Islander Day : понедельник, 15 февраль, 1965
3. Good Friday : пятница, 16 апрель, 1965
4. Canada Day : четверг, 1 июль, 1965
5. Labour Day : понедельник, 6 сентябрь, 1965
6. Remembrance Day : четверг, 11 ноябрь, 1965

And here is the public holiday falling on a weekend:

1. Christmas : суббота, 25 декабрь, 1965