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How many working days in year 2031?
Here is the detail of the calculation:
Because 2031 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 2031.
 Here is the list of these 10 public holidays: 
 
 1. Neujahrstag : середа, 1 січень, 2031 
2. Karfreitag : п'ятниця, 11 квітень, 2031 
3. Ostermontag : понеділок, 14 квітень, 2031 
4. Tag der Arbeit : четвер, 1 травень, 2031 
5. Christi Himmelfahrt : четвер, 22 травень, 2031 
6. Pfingstmontag : понеділок, 2 червень, 2031 
7. Tag der Deutschen Einheit : п'ятниця, 3 жовтень, 2031 
8. Reformationstag : п'ятниця, 31 жовтень, 2031 
9. Weihnachtstag : четвер, 25 грудень, 2031 
10. Zweiter Weihnachtsfeiertag : п'ятниця, 26 грудень, 2031