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How many working days in year 1915?
Here is the detail of the calculation:
Because 1915 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 10 public holidays that do not fall during a weekend and we obtain 251 working days in 1915.
 Here is the list of these 10 public holidays: 
 
 1. New Year's Day : Friday, 1 January, 1915 
2. Family Day : Monday, 15 February, 1915 
3. Good Friday : Friday, 2 April, 1915 
4. Victoria Day : Monday, 24 May, 1915 
5. Canada Day : Thursday, 1 July, 1915 
6. August Civic Holiday : Monday, 2 August, 1915 
7. Labour Day : Monday, 6 September, 1915 
8. Thanksgiving : Monday, 11 October, 1915 
9. Christmas (observance) : Monday, 27 December, 1915 
10. Boxing Day (observance) : Tuesday, 28 December, 1915 
And here are the 2 public holidays falling on a weekend:
1. Christmas : Saturday, 25 December, 1915 
2. Boxing Day : Sunday, 26 December, 1915