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How many working days in year 2023?
Here is the detail of the calculation:
Because 2023 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 9 public holidays that do not fall during a weekend and we obtain 251 working days in 2023.
 Here is the list of these 9 public holidays: 
 
 1. Good Friday : Friday, 7 April, 2023 
2. Easter Monday : Monday, 10 April, 2023 
3. Labour Day : Monday, 1 May, 2023 
4. Ascension Day : Thursday, 18 May, 2023 
5. Whit Monday : Monday, 29 May, 2023 
6. Day of German Unity : Tuesday, 3 October, 2023 
7. Reformation Day : Tuesday, 31 October, 2023 
8. Christmas Day : Monday, 25 December, 2023 
9. Boxing Day : Tuesday, 26 December, 2023 
And here is the public holiday falling on a weekend:
1. New Year's Day : Sunday, 1 January, 2023