Определить период

...

How many working days in year 1989?

Here is the detail of the calculation:

Because 1989 is not a leap year, it has 365 days.

Let's remove 52 saturdays and 53 sundays. It remains 260 days.

Now, let's remove 8 public holidays that do not fall during a weekend and we obtain 252 working days in 1989.

Here is the list of these 8 public holidays:

1. New Year's Day (observance) : понедельник, 2 январь, 1989
2. Louis Riel Day : понедельник, 20 февраль, 1989
3. Good Friday : пятница, 24 март, 1989
4. Victoria Day : понедельник, 22 май, 1989
5. Canada Day (observance) : понедельник, 3 июль, 1989
6. Labour Day : понедельник, 4 сентябрь, 1989
7. Thanksgiving : понедельник, 9 октябрь, 1989
8. Christmas : понедельник, 25 декабрь, 1989

And here are the 2 public holidays falling on a weekend:

1. New Year's Day : воскресенье, 1 январь, 1989
2. Canada Day : суббота, 1 июль, 1989