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How many working days in year 2070?
Here is the detail of the calculation:
Because 2070 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 2070.
 Here is the list of these 12 public holidays: 
 
 1. Πρωτοχρονιά : Wednesday, 1 January, 2070 
2. Θεοφάνεια : Monday, 6 January, 2070 
3. Καθαρά Δευτέρα : Monday, 17 March, 2070 
4. Εικοστή Πέμπτη Μαρτίου : Tuesday, 25 March, 2070 
5. Εργατική Πρωτομαγιά : Thursday, 1 May, 2070 
6. Μεγάλη Παρασκευή : Friday, 2 May, 2070 
7. Δευτέρα του Πάσχα : Monday, 5 May, 2070 
8. Δευτέρα Πεντηκοστής : Monday, 23 June, 2070 
9. Κοίμηση της Θεοτόκου : Friday, 15 August, 2070 
10. Ημέρα του Όχι : Tuesday, 28 October, 2070 
11. Χριστούγεννα : Thursday, 25 December, 2070 
12. Σύναξη της Θεοτόκου : Friday, 26 December, 2070 
And here are the 2 public holidays falling on a weekend:
1. Ορθόδοξο Πάσχα : Sunday, 4 May, 2070 
2. Πεντηκοστή : Sunday, 22 June, 2070