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How many working days in year 2018?
Here is the detail of the calculation:
Because 2018 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 15 public holidays that do not fall during a weekend and we obtain 246 working days in 2018.
 Here is the list of these 15 public holidays: 
 
 1. New Year's Day : Monday, January 1, 2018 
2. Martin Luther King Day : Monday, January 15, 2018 
3. Susan B. Anthony Day : Thursday, February 15, 2018 
4. Washington's Birthday : Monday, February 19, 2018 
5. Memorial Day : Monday, May 28, 2018 
6. Juneteenth National Independence Day : Tuesday, June 19, 2018 
7. Independence Day : Wednesday, July 4, 2018 
8. Labor Day : Monday, September 3, 2018 
9. Columbus Day : Monday, October 8, 2018 
10. Veterans Day (observance) : Monday, November 12, 2018 
11. Thanksgiving : Thursday, November 22, 2018 
12. Black Friday : Friday, November 23, 2018 
13. Christmas Eve : Monday, December 24, 2018 
14. Christmas : Tuesday, December 25, 2018 
15. New Year's Eve : Monday, December 31, 2018 
And here is the public holiday falling on a weekend:
1. Veterans Day : Sunday, November 11, 2018