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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 9 public holidays that do not fall during a weekend and we obtain 252 working days in 1988.

Here is the list of these 9 public holidays:

1. Restoration Day of the Independent Czech State : пятница, 1 январь, 1988
2. Good Friday : пятница, 1 апрель, 1988
3. Easter Monday : понедельник, 4 апрель, 1988
4. St Cyril and Methodius' Day : вторник, 5 июль, 1988
5. Jan Hus Day : среда, 6 июль, 1988
6. St Wenceslas Day : среда, 28 сентябрь, 1988
7. Independence Day : пятница, 28 октябрь, 1988
8. Freedom and Democracy Day : четверг, 17 ноябрь, 1988
9. St. Stephen's Day : понедельник, 26 декабрь, 1988

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

1. Labour Day : воскресенье, 1 май, 1988
2. Liberation Day : воскресенье, 8 май, 1988
3. Christmas Eve : суббота, 24 декабрь, 1988
4. Christmas Day : воскресенье, 25 декабрь, 1988