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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 9 public holidays that do not fall during a weekend and we obtain 252 working days in 1900.
 Here is the list of these 9 public holidays: 
 
 1. Capodanno : понеділок, 1 січень, 1900 
2. Lunedì di Pasqua : понеділок, 16 квітень, 1900 
3. Anniversario Liberazione : середа, 25 квітень, 1900 
4. Festa del lavoro : вівторок, 1 травень, 1900 
5. Ferragosto o Assunzione : середа, 15 серпень, 1900 
6. Festa di San Gennaro : середа, 19 вересень, 1900 
7. Ognissanti o Tutti i Santi : четвер, 1 листопад, 1900 
8. Santo Natale : вівторок, 25 грудень, 1900 
9. Santo Stefano : середа, 26 грудень, 1900 
And here are the 3 public holidays falling on a weekend:
1. Epifania : субота, 6 січень, 1900 
2. Festa della Repubblica Italia : субота, 2 червень, 1900 
3. Immacolata Concezione : субота, 8 грудень, 1900