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How many working days in year 1970?
Here is the detail of the calculation:
Because 1970 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 7 public holidays that do not fall during a weekend and we obtain 254 working days in 1970.
 Here is the list of these 7 public holidays: 
 
 1. Capodanno : Thursday, 1 January, 1970 
2. Epifania : Tuesday, 6 January, 1970 
3. Lunedì di Pasqua : Monday, 30 March, 1970 
4. Festa del lavoro : Friday, 1 May, 1970 
5. Festa della Repubblica Italia : Tuesday, 2 June, 1970 
6. Immacolata Concezione : Tuesday, 8 December, 1970 
7. Santo Natale : Friday, 25 December, 1970 
And here are the 5 public holidays falling on a weekend:
1. Anniversario Liberazione : Saturday, 25 April, 1970 
2. Ferragosto o Assunzione : Saturday, 15 August, 1970 
3. Festa di San Gennaro : Saturday, 19 September, 1970 
4. Ognissanti o Tutti i Santi : Sunday, 1 November, 1970 
5. Santo Stefano : Saturday, 26 December, 1970