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How many working days in year 2004?
Here is the detail of the calculation:
Because 2004 is a leap year, it has 366 days.
Let's remove 52 saturdays and 52 sundays. It remains 262 days.
Now, let's remove 12 public holidays that do not fall during a weekend and we obtain 250 working days in 2004.
 Here is the list of these 12 public holidays: 
 
 1. New Year's Day : Thursday, January 1, 2004 
2. Martin Luther King Day : Monday, January 19, 2004 
3. Memorial Day : Monday, May 31, 2004 
4. Juneteenth (observance) : Friday, June 18, 2004 
5. Independence Day (observance) : Monday, July 5, 2004 
6. Labor Day : Monday, September 6, 2004 
7. Columbus Day : Monday, October 11, 2004 
8. Veterans Day : Thursday, November 11, 2004 
9. Thanksgiving : Thursday, November 25, 2004 
10. Black Friday : Friday, November 26, 2004 
11. Christmas (observance) : Friday, December 24, 2004 
12. New Year's Day (observance) : Friday, December 31, 2004 
And here are the 3 public holidays falling on a weekend:
1. Juneteenth National Independence Day : Saturday, June 19, 2004 
2. Independence Day : Sunday, July 4, 2004 
3. Christmas : Saturday, December 25, 2004