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How many working days in year 2028?
Here is the detail of the calculation:
Because 2028 is a leap year, it has 366 days.
Let's remove 53 saturdays and 53 sundays. It remains 260 days.
Now, let's remove 7 public holidays that do not fall during a weekend and we obtain 253 working days in 2028.
 Here is the list of these 7 public holidays: 
 
 1. Karfreitag : п'ятниця, 14 квітень, 2028 
2. Ostermontag : понеділок, 17 квітень, 2028 
3. Staatsfeiertag : понеділок, 1 травень, 2028 
4. Pfingstmontag : понеділок, 5 червень, 2028 
5. Nationalfeiertag : четвер, 26 жовтень, 2028 
6. Weihnachten : понеділок, 25 грудень, 2028 
7. Stefanitag : вівторок, 26 грудень, 2028 
And here are the 3 public holidays falling on a weekend:
1. Neujahrstag : субота, 1 січень, 2028 
2. Heiliger Abend : неділя, 24 грудень, 2028 
3. Silvesters : неділя, 31 грудень, 2028