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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 11 public holidays that do not fall during a weekend and we obtain 250 working days in 1900.

Here is the list of these 11 public holidays:

1. New Year's Day : понедельник, январь 1, 1900
2. Martin Luther King Day : понедельник, январь 15, 1900
3. Washington's Birthday : понедельник, февраль 19, 1900
4. Memorial Day : понедельник, май 28, 1900
5. Juneteenth National Independence Day : вторник, июнь 19, 1900
6. Independence Day : среда, июль 4, 1900
7. Labor Day : понедельник, сентябрь 3, 1900
8. Veterans Day (observance) : понедельник, ноябрь 12, 1900
9. Thanksgiving : четверг, ноябрь 22, 1900
10. Christmas Eve : понедельник, декабрь 24, 1900
11. Christmas : вторник, декабрь 25, 1900

And here is the public holiday falling on a weekend:

1. Veterans Day : воскресенье, ноябрь 11, 1900