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How many working days in year 2079?
Here is the detail of the calculation:
Because 2079 is not a leap year, it has 365 days.
Let's remove 52 saturdays and 53 sundays. It remains 260 days.
Now, let's remove 14 public holidays that do not fall during a weekend and we obtain 246 working days in 2079.
 Here is the list of these 14 public holidays: 
 
 1. New Year's Day (observance) : monday, january 2, 2079 
2. Martin Luther King Day : monday, january 16, 2079 
3. Lincoln's Birthday (observance) : monday, february 13, 2079 
4. Washington's Birthday : monday, february 20, 2079 
5. Good Friday : friday, april 21, 2079 
6. Memorial Day : monday, may 29, 2079 
7. Juneteenth National Independence Day : monday, june 19, 2079 
8. Independence Day : tuesday, july 4, 2079 
9. Labor Day : monday, september 4, 2079 
10. Columbus Day : monday, october 9, 2079 
11. Election Day : tuesday, november 7, 2079 
12. Veterans Day (observance) : friday, november 10, 2079 
13. Thanksgiving : thursday, november 23, 2079 
14. Christmas : monday, december 25, 2079 
And here are the 3 public holidays falling on a weekend:
1. New Year's Day : sunday, january 1, 2079 
2. Lincoln's Birthday : sunday, february 12, 2079 
3. Veterans Day : saturday, november 11, 2079