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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 13 public holidays that do not fall during a weekend and we obtain 248 working days in 2013.
 Here is the list of these 13 public holidays: 
 
 1. New Year's Day : вівторок, 1 січень, 2013 
2. Coming of Age Day : понеділок, 14 січень, 2013 
3. Foundation Day : понеділок, 11 лютий, 2013 
4. Vernal Equinox Day : середа, 20 березень, 2013 
5. Shōwa Day : понеділок, 29 квітень, 2013 
6. Constitution Memorial Day : п'ятниця, 3 травень, 2013 
7. Children's Day (observance) : понеділок, 6 травень, 2013 
8. Marine Day : понеділок, 15 липень, 2013 
9. Respect-for-Aged Day : понеділок, 16 вересень, 2013 
10. Autumnal Equinox Day : понеділок, 23 вересень, 2013 
11. Health and Sports Day : понеділок, 14 жовтень, 2013 
12. Culture Day (observance) : понеділок, 4 листопад, 2013 
13. Emperor's Birthday : понеділок, 23 грудень, 2013 
And here are the 4 public holidays falling on a weekend:
1. Greenery Day : субота, 4 травень, 2013 
2. Children's Day : неділя, 5 травень, 2013 
3. Culture Day : неділя, 3 листопад, 2013 
4. Labor Thanksgiving Day : субота, 23 листопад, 2013