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How many working days in year 2021?
Here is the detail of the calculation:
Because 2021 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 6 public holidays that do not fall during a weekend and we obtain 255 working days in 2021.
 Here is the list of these 6 public holidays: 
 
 1. Neujahrstag : п'ятниця, 1 січень, 2021 
2. Internationaler Frauentag : понеділок, 8 березень, 2021 
3. Karfreitag : п'ятниця, 2 квітень, 2021 
4. Ostermontag : понеділок, 5 квітень, 2021 
5. Christi Himmelfahrt : четвер, 13 травень, 2021 
6. Pfingstmontag : понеділок, 24 травень, 2021 
And here are the 4 public holidays falling on a weekend:
1. Tag der Arbeit : субота, 1 травень, 2021 
2. Tag der Deutschen Einheit : неділя, 3 жовтень, 2021 
3. Weihnachtstag : субота, 25 грудень, 2021 
4. Zweiter Weihnachtsfeiertag : неділя, 26 грудень, 2021