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How many working days in year 1900?

Here is the detail of the calculation:

Because 1900 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 8 public holidays that do not fall during a weekend and we obtain 253 working days in 1900.

Here is the list of these 8 public holidays:

1. New Year's Day : понедельник, 1 январь, 1900
2. Good Friday : пятница, 13 апрель, 1900
3. Easter Monday : понедельник, 16 апрель, 1900
4. Queen's Day : понедельник, 30 апрель, 1900
5. Ascension Day : четверг, 24 май, 1900
6. Pentecost Monday : понедельник, 4 июнь, 1900
7. Christmas Day : вторник, 25 декабрь, 1900
8. Boxing Day : среда, 26 декабрь, 1900

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

1. Easter Sunday : воскресенье, 15 апрель, 1900
2. Liberation Day : суббота, 5 май, 1900
3. Pentecost Sunday : воскресенье, 3 июнь, 1900