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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 7 public holidays that do not fall during a weekend and we obtain 254 working days in 2015.
 Here is the list of these 7 public holidays: 
 
 1. Uudenvuodenpäivä : Thursday, 1 January, 2015 
2. Loppiainen : Tuesday, 6 January, 2015 
3. Pitkäperjantai : Friday, 3 April, 2015 
4. 2. pääsiäispäivä : Monday, 6 April, 2015 
5. Vappu : Friday, 1 May, 2015 
6. Helatorstai : Thursday, 14 May, 2015 
7. Joulupäivä : Friday, 25 December, 2015 
And here are the 6 public holidays falling on a weekend:
1. Pääsiäispäivä : Sunday, 5 April, 2015 
2. Helluntaipäivä : Sunday, 24 May, 2015 
3. Juhannuspäivä : Saturday, 20 June, 2015 
4. Pyhäinpäivä : Saturday, 31 October, 2015 
5. Itsenäisyyspäivä : Sunday, 6 December, 2015 
6. Tapaninpäivä : Saturday, 26 December, 2015