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How many working days in year 2015?
Here is the detail of the calculation:
Because 2015 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 2015.
 Here is the list of these 9 public holidays: 
 
 1. New Year's Day : Thursday, 1 January, 2015 
2. Good Friday : Friday, 3 April, 2015 
3. Easter Monday : Monday, 6 April, 2015 
4. Labour Day : Friday, 1 May, 2015 
5. Ascension Day : Thursday, 14 May, 2015 
6. Whit Monday : Monday, 25 May, 2015 
7. National Day : Tuesday, 23 June, 2015 
8. Christmas Eve : Thursday, 24 December, 2015 
9. Christmas Day : Friday, 25 December, 2015 
And here are the 3 public holidays falling on a weekend:
1. Assumption of Mary : Saturday, 15 August, 2015 
2. All Saints' Day : Sunday, 1 November, 2015 
3. St. Stephen's Day : Saturday, 26 December, 2015