Определить период

...

How many working days in year 1988?

Here is the detail of the calculation:

Because 1988 is a leap year, it has 366 days.

Let's remove 53 saturdays and 52 sundays. It remains 261 days.

Now, let's remove 4 public holidays that do not fall during a weekend and we obtain 257 working days in 1988.

Here is the list of these 4 public holidays:

1. New Year's Day : пятница, 1 январь, 1988
2. Commemoration of Atatürk, Youth and Sports Day : четверг, 19 май, 1988
3. Victory Day : вторник, 30 август, 1988
4. Republic Day Eve : пятница, 28 октябрь, 1988

And here are the 3 public holidays falling on a weekend:

1. National Sovereignty and Children's Day : суббота, 23 апрель, 1988
2. Labour and Solidarity Day : воскресенье, 1 май, 1988
3. Republic Day : суббота, 29 октябрь, 1988