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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 13 public holidays that do not fall during a weekend and we obtain 249 working days in 2004.
 Here is the list of these 13 public holidays: 
 
 1. New Year's Day : четвер, січень 1, 2004 
2. Martin Luther King Day : понеділок, січень 19, 2004 
3. Mardi gras day : вівторок, лютий 24, 2004 
4. Good Friday : п'ятниця, квітень 9, 2004 
5. Memorial Day : понеділок, травень 31, 2004 
6. Juneteenth (observance) : п'ятниця, червень 18, 2004 
7. Independence Day (observance) : понеділок, липень 5, 2004 
8. Labor Day : понеділок, вересень 6, 2004 
9. Election Day : вівторок, листопад 2, 2004 
10. Veterans Day : четвер, листопад 11, 2004 
11. Thanksgiving : четвер, листопад 25, 2004 
12. Christmas (observance) : п'ятниця, грудень 24, 2004 
13. New Year's Day (observance) : п'ятниця, грудень 31, 2004 
And here are the 3 public holidays falling on a weekend:
1. Juneteenth National Independence Day : субота, червень 19, 2004 
2. Independence Day : неділя, липень 4, 2004 
3. Christmas : субота, грудень 25, 2004