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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 6 public holidays that do not fall during a weekend and we obtain 255 working days in 1988.

Here is the list of these 6 public holidays:

1. New Year's Day : пятница, 1 январь, 1988
2. Good Friday : пятница, 1 апрель, 1988
3. Easter Monday : понедельник, 4 апрель, 1988
4. Ascension Day : четверг, 12 май, 1988
5. Pentecost Monday : понедельник, 23 май, 1988
6. Boxing Day : понедельник, 26 декабрь, 1988

And here are the 4 public holidays falling on a weekend:

1. Easter Sunday : воскресенье, 3 апрель, 1988
2. Queen's Day : суббота, 30 апрель, 1988
3. Pentecost Sunday : воскресенье, 22 май, 1988
4. Christmas Day : воскресенье, 25 декабрь, 1988