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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. Independence Movement Day : четверг, 1 март, 1900
3. Children's Day : понедельник, 7 май, 1900
4. Memorial Day : среда, 6 июнь, 1900
5. Liberation Day : среда, 15 август, 1900
6. National Foundation Day : среда, 3 октябрь, 1900
7. Hangeul Day : вторник, 9 октябрь, 1900
8. Christmas Day : вторник, 25 декабрь, 1900

And here is the public holiday falling on a weekend:

1. Children's Day : суббота, 5 май, 1900