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How many working days in year 1921?
Here is the detail of the calculation:
Because 1921 is not a leap year, it has 365 days.
Let's remove 53 saturdays and 52 sundays. It remains 260 days.
Now, let's remove 9 public holidays that do not fall during a weekend and we obtain 251 working days in 1921.
 Here is the list of these 9 public holidays: 
 
 1. Epifania : четвер, 6 січень, 1921 
2. Lunedì di Pasqua : понеділок, 28 березень, 1921 
3. Anniversario Liberazione : понеділок, 25 квітень, 1921 
4. Sa Die de Sa Sardigna : четвер, 28 квітень, 1921 
5. Festa della Repubblica Italia : четвер, 2 червень, 1921 
6. Ferragosto o Assunzione : понеділок, 15 серпень, 1921 
7. Ognissanti o Tutti i Santi : вівторок, 1 листопад, 1921 
8. Immacolata Concezione : четвер, 8 грудень, 1921 
9. Santo Stefano : понеділок, 26 грудень, 1921 
And here are the 3 public holidays falling on a weekend:
1. Capodanno : субота, 1 січень, 1921 
2. Festa del lavoro : неділя, 1 травень, 1921 
3. Santo Natale : неділя, 25 грудень, 1921