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How many working days in year 2018?
Here is the detail of the calculation:
Because 2018 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 2018.
 Here is the list of these 10 public holidays: 
 
 1. New Year's Day : Monday, 1 January, 2018 
2. Good Friday : Friday, 30 March, 2018 
3. Easter Monday : Monday, 2 April, 2018 
4. Labour Day : Tuesday, 1 May, 2018 
5. Ascension Day : Thursday, 10 May, 2018 
6. Whit Monday : Monday, 21 May, 2018 
7. Day of German Unity : Wednesday, 3 October, 2018 
8. Reformation Day : Wednesday, 31 October, 2018 
9. Christmas Day : Tuesday, 25 December, 2018 
10. Boxing Day : Wednesday, 26 December, 2018 
And here is the public holiday falling on a weekend:
1. Epiphany : Saturday, 6 January, 2018