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How many working days in year 1903?
Here is the detail of the calculation:
Because 1903 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 9 public holidays that do not fall during a weekend and we obtain 252 working days in 1903.
 Here is the list of these 9 public holidays: 
 
 1. Нова Година : Thursday, 1 January, 1903 
2. Празник после Нове Године : Friday, 2 January, 1903 
3. Божић : Wednesday, 7 January, 1903 
4. Дан после Дана државности Србије : Monday, 16 February, 1903 
5. Дан после Дана државности Србије : Tuesday, 17 February, 1903 
6. Велики петак : Friday, 17 April, 1903 
7. Васкршњи понедељак : Monday, 20 April, 1903 
8. Празник рада : Friday, 1 May, 1903 
9. Дан примирја : Wednesday, 11 November, 1903 
And here are the 4 public holidays falling on a weekend:
1. Дан државности Србије : Sunday, 15 February, 1903 
2. Васкршња субота : Saturday, 18 April, 1903 
3. Васкрс : Sunday, 19 April, 1903 
4. Празник после Празника рада : Saturday, 2 May, 1903