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How many working days in year 2123?
Here is the detail of the calculation:
Because 2123 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 7 public holidays that do not fall during a weekend and we obtain 254 working days in 2123.
 Here is the list of these 7 public holidays: 
 
 1. Jour de l'An : п'ятниця, 1 січень, 2123 
2. Lundi de Pâques : понеділок, 12 квітень, 2123 
3. Jeudi de l'Ascension : четвер, 20 травень, 2123 
4. Lundi de la Pentecôte : понеділок, 31 травень, 2123 
5. Fête Nationale : середа, 21 липень, 2123 
6. Toussaint : понеділок, 1 листопад, 2123 
7. Fête de l'Armistice : четвер, 11 листопад, 2123 
And here are the 4 public holidays falling on a weekend:
1. Fête du Travail : субота, 1 травень, 2123 
2. Fête de la Communauté flamande : неділя, 11 липень, 2123 
3. Assomption : неділя, 15 серпень, 2123 
4. Noël : субота, 25 грудень, 2123