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How many working days in year 2129?
Here is the detail of the calculation:
Because 2129 is not a leap year, it has 365 days.
Let's remove 53 saturdays and 52 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 2129.
 Here is the list of these 7 public holidays: 
 
 1. Lundi de Pâques : понеділок, 11 квітень, 2129 
2. Jeudi de l'Ascension : четвер, 19 травень, 2129 
3. Lundi de la Pentecôte : понеділок, 30 травень, 2129 
4. Fête Nationale : четвер, 21 липень, 2129 
5. Assomption : понеділок, 15 серпень, 2129 
6. Toussaint : вівторок, 1 листопад, 2129 
7. Fête de l'Armistice : п'ятниця, 11 листопад, 2129 
And here are the 3 public holidays falling on a weekend:
1. Jour de l'An : субота, 1 січень, 2129 
2. Fête du Travail : неділя, 1 травень, 2129 
3. Noël : неділя, 25 грудень, 2129