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How many working days in year 1930?
Here is the detail of the calculation:
Because 1930 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 1930.
 Here is the list of these 9 public holidays: 
 
 1. Újév : Wednesday, 1 January, 1930 
2. Nagypéntek : Friday, 18 April, 1930 
3. Húsvét hétfő : Monday, 21 April, 1930 
4. A munka ünnepe : Thursday, 1 May, 1930 
5. Pünkösd hétfő : Monday, 9 June, 1930 
6. Az államalapítás ünnepe : Wednesday, 20 August, 1930 
7. Nemzeti ünnep : Thursday, 23 October, 1930 
8. Karácsony : Thursday, 25 December, 1930 
9. Karácsony másnapja : Friday, 26 December, 1930 
And here are the 4 public holidays falling on a weekend:
1. Nemzeti ünnep : Saturday, 15 March, 1930 
2. Húsvét vasárnap : Sunday, 20 April, 1930 
3. Pünkösd vasárnap : Sunday, 8 June, 1930 
4. Mindenszentek : Saturday, 1 November, 1930