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How many working days in year 1904?
Here is the detail of the calculation:
Because 1904 is a leap year, it has 366 days.
Let's remove 53 saturdays and 52 sundays. It remains 261 days.
Now, let's remove 12 public holidays that do not fall during a weekend and we obtain 249 working days in 1904.
 Here is the list of these 12 public holidays: 
 
 1. New Year's Day : Friday, 1 January, 1904 
2. Good Friday : Friday, 1 April, 1904 
3. Easter Monday : Monday, 4 April, 1904 
4. Victoria Day : Monday, 23 May, 1904 
5. Canada Day : Friday, 1 July, 1904 
6. Nunavut Day (observance) : Monday, 11 July, 1904 
7. August Civic Holiday : Monday, 1 August, 1904 
8. Labour Day : Monday, 5 September, 1904 
9. Thanksgiving : Monday, 10 October, 1904 
10. Remembrance Day : Friday, 11 November, 1904 
11. Boxing Day : Monday, 26 December, 1904 
12. Christmas (observance) : Tuesday, 27 December, 1904 
And here are the 2 public holidays falling on a weekend:
1. Nunavut Day : Saturday, 9 July, 1904 
2. Christmas : Sunday, 25 December, 1904