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How many working days in year 1983?
Here is the detail of the calculation:
Because 1983 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 5 public holidays that do not fall during a weekend and we obtain 255 working days in 1983.
 Here is the list of these 5 public holidays: 
 
 1. Good Friday : Friday, 1 April, 1983 
2. Easter Monday : Monday, 4 April, 1983 
3. Ascension Day : Thursday, 12 May, 1983 
4. Pentecost Monday : Monday, 23 May, 1983 
5. Boxing Day : Monday, 26 December, 1983 
And here are the 5 public holidays falling on a weekend:
1. New Year's Day : Saturday, 1 January, 1983 
2. Easter Sunday : Sunday, 3 April, 1983 
3. Queen's Day : Saturday, 30 April, 1983 
4. Pentecost Sunday : Sunday, 22 May, 1983 
5. Christmas Day : Sunday, 25 December, 1983