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How many working days in year 2066?
Here is the detail of the calculation:
Because 2066 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 2066.
 Here is the list of these 12 public holidays: 
 
 1. Нова година : Friday, 1 January, 2066 
2. Национален ден : Wednesday, 3 March, 2066 
3. Православни Велики петък : Friday, 16 April, 2066 
4. Православни Велики понеделник : Monday, 19 April, 2066 
5. Ден на труда (наблюдаван) : Monday, 3 May, 2066 
6. Гергьовден : Thursday, 6 May, 2066 
7. Ден на културата и славянската писменост : Monday, 24 May, 2066 
8. Ден на съединението : Monday, 6 September, 2066 
9. Ден на независимостта : Wednesday, 22 September, 2066 
10. Бъдни вечер : Friday, 24 December, 2066 
11. Коледа (наблюдаван) : Monday, 27 December, 2066 
12. Коледа (наблюдаван) : Tuesday, 28 December, 2066 
And here are the 5 public holidays falling on a weekend:
1. Православна Велика събота : Saturday, 17 April, 2066 
2. Православен Великден : Sunday, 18 April, 2066 
3. Ден на труда : Saturday, 1 May, 2066 
4. Коледа : Saturday, 25 December, 2066 
5. Втори ден на Коледа : Sunday, 26 December, 2066