How many working days in year 2086?
Here is the detail of the calculation:
Because 2086 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 9 public holidays that do not fall during a weekend and we obtain 252 working days in 2086.
 Here is the list of these 9 public holidays: 
 
 1. Jour de l'An : вторник, 1 январь, 2086 
2. Lundi de Pâques : понедельник, 1 апрель, 2086 
3. Fête du Travail : среда, 1 май, 2086 
4. Journée de l’Europe : четверг, 9 май, 2086 
5. Lundi de la Pentecôte : понедельник, 20 май, 2086 
6. Assomption : четверг, 15 август, 2086 
7. Toussaint : пятница, 1 ноябрь, 2086 
8. Noël : среда, 25 декабрь, 2086 
9. Saint-Étienne : четверг, 26 декабрь, 2086 
And here is the public holiday falling on a weekend:
1. Fête Nationale : воскресенье, 23 июнь, 2086