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How many working days in year 2090?
Here is the detail of the calculation:
Because 2090 is not a leap year, it has 365 days.
Let's remove 52 saturdays and 53 sundays. It remains 260 days.
Now, let's remove 7 public holidays that do not fall during a weekend and we obtain 253 working days in 2090.
 Here is the list of these 7 public holidays: 
 
 1. Празник после Нове Године : Monday, 2 January, 2090 
2. Дан државности Србије : Wednesday, 15 February, 2090 
3. Дан после Дана државности Србије : Thursday, 16 February, 2090 
4. Велики петак : Friday, 21 April, 2090 
5. Васкршњи понедељак : Monday, 24 April, 2090 
6. Празник рада : Monday, 1 May, 2090 
7. Празник после Празника рада : Tuesday, 2 May, 2090 
And here are the 5 public holidays falling on a weekend:
1. Нова Година : Sunday, 1 January, 2090 
2. Божић : Saturday, 7 January, 2090 
3. Васкршња субота : Saturday, 22 April, 2090 
4. Васкрс : Sunday, 23 April, 2090 
5. Дан примирја : Saturday, 11 November, 2090