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How many working days in year 2013?
Here is the detail of the calculation:
Because 2013 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 8 public holidays that do not fall during a weekend and we obtain 253 working days in 2013.
 Here is the list of these 8 public holidays: 
 
 1. Uudenvuodenpäivä : Tuesday, 1 January, 2013 
2. Pitkäperjantai : Friday, 29 March, 2013 
3. 2. pääsiäispäivä : Monday, 1 April, 2013 
4. Vappu : Wednesday, 1 May, 2013 
5. Helatorstai : Thursday, 9 May, 2013 
6. Itsenäisyyspäivä : Friday, 6 December, 2013 
7. Joulupäivä : Wednesday, 25 December, 2013 
8. Tapaninpäivä : Thursday, 26 December, 2013 
And here are the 5 public holidays falling on a weekend:
1. Loppiainen : Sunday, 6 January, 2013 
2. Pääsiäispäivä : Sunday, 31 March, 2013 
3. Helluntaipäivä : Sunday, 19 May, 2013 
4. Juhannuspäivä : Saturday, 22 June, 2013 
5. Pyhäinpäivä : Saturday, 2 November, 2013