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How many working days in year 2020?
Here is the detail of the calculation:
Because 2020 is a leap year, it has 366 days.
Let's remove 52 saturdays and 52 sundays. It remains 262 days.
Now, let's remove 14 public holidays that do not fall during a weekend and we obtain 248 working days in 2020.
 Here is the list of these 14 public holidays: 
 
 1. New Year's Day : середа, січень 1, 2020 
2. Martin Luther King Day : понеділок, січень 20, 2020 
3. Washington's Birthday : понеділок, лютий 17, 2020 
4. Prince Jonah Kuhio Kalanianaole Day : четвер, березень 26, 2020 
5. Good Friday : п'ятниця, квітень 10, 2020 
6. Memorial Day : понеділок, травень 25, 2020 
7. King Kamehameha I Day : четвер, червень 11, 2020 
8. Independence Day (observance) : п'ятниця, липень 3, 2020 
9. Statehood Day : п'ятниця, серпень 21, 2020 
10. Labor Day : понеділок, вересень 7, 2020 
11. Election Day : вівторок, листопад 3, 2020 
12. Veterans Day : середа, листопад 11, 2020 
13. Thanksgiving : четвер, листопад 26, 2020 
14. Christmas : п'ятниця, грудень 25, 2020 
And here is the public holiday falling on a weekend:
1. Independence Day : субота, липень 4, 2020