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How many working days in year 2129?
Here is the detail of the calculation:
Because 2129 is not a leap year, it has 365 days.
Let's remove 53 saturdays and 52 sundays. It remains 260 days.
Now, let's remove 15 public holidays that do not fall during a weekend and we obtain 245 working days in 2129.
 Here is the list of these 15 public holidays: 
 
 1. New Year's Day (observance) : понеділок, 3 січень, 2129 
2. Coming of Age Day : понеділок, 10 січень, 2129 
3. Foundation Day : п'ятниця, 11 лютий, 2129 
4. Emperor's Birthday : середа, 23 лютий, 2129 
5. Shōwa Day : п'ятниця, 29 квітень, 2129 
6. Constitution Memorial Day : вівторок, 3 травень, 2129 
7. Greenery Day : середа, 4 травень, 2129 
8. Children's Day : четвер, 5 травень, 2129 
9. Marine Day : понеділок, 18 липень, 2129 
10. Mountain Day : четвер, 11 серпень, 2129 
11. Respect-for-Aged Day : понеділок, 19 вересень, 2129 
12. Autumnal Equinox Day : п'ятниця, 23 вересень, 2129 
13. Health and Sports Day : понеділок, 10 жовтень, 2129 
14. Culture Day : четвер, 3 листопад, 2129 
15. Labor Thanksgiving Day : середа, 23 листопад, 2129 
And here are the 2 public holidays falling on a weekend:
1. New Year's Day : субота, 1 січень, 2129 
2. Vernal Equinox Day : неділя, 20 березень, 2129