How many working days in year 2080?
Here is the detail of the calculation:
Because 2080 is a leap year, it has 366 days.
Let's remove 52 saturdays and 52 sundays. It remains 262 days.
Now, let's remove 8 public holidays that do not fall during a weekend and we obtain 254 working days in 2080.
 Here is the list of these 8 public holidays: 
 
 1. New Year's Day : понедельник, 1 январь, 2080 
2. Good Friday : пятница, 5 апрель, 2080 
3. Easter Monday : понедельник, 8 апрель, 2080 
4. May Day : среда, 1 май, 2080 
5. Ascension Day : четверг, 16 май, 2080 
6. Independence Day : пятница, 6 декабрь, 2080 
7. Christmas Day : среда, 25 декабрь, 2080 
8. St Stephen's Day : четверг, 26 декабрь, 2080 
And here are the 5 public holidays falling on a weekend:
1. Epiphany : суббота, 6 январь, 2080 
2. Easter Sunday : воскресенье, 7 апрель, 2080 
3. Whit Sunday : воскресенье, 26 май, 2080 
4. Midsummer Day : суббота, 22 июнь, 2080 
5. All Saints' Day : суббота, 2 ноябрь, 2080