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How many working days in year 2040?
Here is the detail of the calculation:
Because 2040 is a leap year, it has 366 days.
Let's remove 52 saturdays and 53 sundays. It remains 261 days.
Now, let's remove 4 public holidays that do not fall during a weekend and we obtain 257 working days in 2040.
 Here is the list of these 4 public holidays: 
 
 1. National Sovereignty and Children's Day : Monday, 23 April, 2040 
2. Labour and Solidarity Day : Tuesday, 1 May, 2040 
3. Victory Day : Thursday, 30 August, 2040 
4. Republic Day : Monday, 29 October, 2040 
And here are the 4 public holidays falling on a weekend:
1. New Year's Day : Sunday, 1 January, 2040 
2. Commemoration of Atatürk, Youth and Sports Day : Saturday, 19 May, 2040 
3. Day of Democracy and Freedoms : Sunday, 15 July, 2040 
4. Republic Day Eve : Sunday, 28 October, 2040