How many working days in year 2042?
Here is the detail of the calculation:
Because 2042 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 2042.
 Here is the list of these 9 public holidays: 
 
 1. Jour de l'An : среда, 1 январь, 2042 
2. Vendredi Saint : пятница, 4 апрель, 2042 
3. Lundi de Pâques : понедельник, 7 апрель, 2042 
4. Fête du Travail : четверг, 1 май, 2042 
5. Jeudi de l'Ascension : четверг, 15 май, 2042 
6. Lundi de la Pentecôte : понедельник, 26 май, 2042 
7. Fête nationale suisse : пятница, 1 август, 2042 
8. Noël : четверг, 25 декабрь, 2042 
9. Saint Étienne : пятница, 26 декабрь, 2042