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How many working days in year 1988?
Here is the detail of the calculation:
Because 1988 is a leap year, it has 366 days.
Let's remove 53 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 1988.
 Here is the list of these 9 public holidays: 
 
 1. Novo leto : Friday, 1 January, 1988 
2. Prešernov dan : Monday, 8 February, 1988 
3. Velikonočni ponedeljek : Monday, 4 April, 1988 
4. Dan upora proti okupatorju : Wednesday, 27 April, 1988 
5. Praznik dela : Monday, 2 May, 1988 
6. Marijino vnebovzetje : Monday, 15 August, 1988 
7. Dan reformacije : Monday, 31 October, 1988 
8. Dan spomina na mrtve : Tuesday, 1 November, 1988 
9. Dan samostojnosti in enotnosti : Monday, 26 December, 1988 
And here are the 6 public holidays falling on a weekend:
1. Novoletni dan : Saturday, 2 January, 1988 
2. Velika noč : Sunday, 3 April, 1988 
3. Praznik dela : Sunday, 1 May, 1988 
4. Binkošti : Sunday, 22 May, 1988 
5. Dan državnosti : Saturday, 25 June, 1988 
6. Božič : Sunday, 25 December, 1988