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How many working days in year 2066?
Here is the detail of the calculation:
Because 2066 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 245 public holidays that do not fall during a weekend and we obtain 245 working days in 2066.
 Here is the list of these 245 public holidays: 
 
 1. New Year's Day : friday, january 1, 2066 
2. Martin Luther King Day : monday, january 18, 2066 
3. Washington's Birthday : monday, february 15, 2066 
4. Prince Jonah Kuhio Kalanianaole Day : friday, march 26, 2066 
5. Good Friday : friday, april 9, 2066 
6. Memorial Day : monday, may 31, 2066 
7. King Kamehameha I Day : friday, june 11, 2066 
8. Juneteenth (observance) : friday, june 18, 2066 
9. Independence Day (observance) : monday, july 5, 2066 
10. Statehood Day : friday, august 20, 2066 
11. Labor Day : monday, september 6, 2066 
12. Election Day : tuesday, november 2, 2066 
13. Veterans Day : thursday, november 11, 2066 
14. Thanksgiving : thursday, november 25, 2066 
15. Christmas (observance) : friday, december 24, 2066 
16. New Year's Day (observance) : friday, december 31, 2066 
And here are the 3 public holidays falling on a weekend:
1. Juneteenth National Independence Day : saturday, june 19, 2066 
2. Independence Day : sunday, july 4, 2066 
3. Christmas : saturday, december 25, 2066