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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 12 public holidays that do not fall during a weekend and we obtain 249 working days in 1930.
 Here is the list of these 12 public holidays: 
 
 1. Πρωτοχρονιά : Wednesday, 1 January, 1930 
2. Θεοφάνεια : Monday, 6 January, 1930 
3. Καθαρά Δευτέρα : Monday, 3 March, 1930 
4. Εικοστή Πέμπτη Μαρτίου : Tuesday, 25 March, 1930 
5. Μεγάλη Παρασκευή : Friday, 18 April, 1930 
6. Δευτέρα του Πάσχα : Monday, 21 April, 1930 
7. Εργατική Πρωτομαγιά : Thursday, 1 May, 1930 
8. Δευτέρα Πεντηκοστής : Monday, 9 June, 1930 
9. Κοίμηση της Θεοτόκου : Friday, 15 August, 1930 
10. Ημέρα του Όχι : Tuesday, 28 October, 1930 
11. Χριστούγεννα : Thursday, 25 December, 1930 
12. Σύναξη της Θεοτόκου : Friday, 26 December, 1930 
And here are the 2 public holidays falling on a weekend:
1. Ορθόδοξο Πάσχα : Sunday, 20 April, 1930 
2. Πεντηκοστή : Sunday, 8 June, 1930