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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. Újév : Friday, 1 January, 2123 
2. Nemzeti ünnep : Monday, 15 March, 2123 
3. Nagypéntek : Friday, 9 April, 2123 
4. Húsvét hétfő : Monday, 12 April, 2123 
5. Pünkösd hétfő : Monday, 31 May, 2123 
6. Az államalapítás ünnepe : Friday, 20 August, 2123 
7. Mindenszentek : Monday, 1 November, 2123 
And here are the 6 public holidays falling on a weekend:
1. Húsvét vasárnap : Sunday, 11 April, 2123 
2. A munka ünnepe : Saturday, 1 May, 2123 
3. Pünkösd vasárnap : Sunday, 30 May, 2123 
4. Nemzeti ünnep : Saturday, 23 October, 2123 
5. Karácsony : Saturday, 25 December, 2123 
6. Karácsony másnapja : Sunday, 26 December, 2123