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How many working days in year 2135?
Here is the detail of the calculation:
Because 2135 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 9 public holidays that do not fall during a weekend and we obtain 251 working days in 2135.
 Here is the list of these 9 public holidays: 
 
 1. Karfreideg : Friday, 1 April, 2135 
2. Ouschterméindeg : Monday, 4 April, 2135 
3. Europadag : Monday, 9 May, 2135 
4. Christi Himmelfaart : Thursday, 12 May, 2135 
5. Péngschtméindeg : Monday, 23 May, 2135 
6. Nationalfeierdag : Thursday, 23 June, 2135 
7. Léiffrawëschdag : Monday, 15 August, 2135 
8. Allerhellegen : Tuesday, 1 November, 2135 
9. Stiefesdag : Monday, 26 December, 2135 
And here are the 4 public holidays falling on a weekend:
1. Neijoerschdag : Saturday, 1 January, 2135 
2. Dag vun der Aarbecht : Sunday, 1 May, 2135 
3. Hellegowend : Saturday, 24 December, 2135 
4. Chrëschtdag : Sunday, 25 December, 2135