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How many working days in year 2086?
Here is the detail of the calculation:
Because 2086 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 13 public holidays that do not fall during a weekend and we obtain 248 working days in 2086.
 Here is the list of these 13 public holidays: 
 
 1. New Year's Day : Tuesday, 1 January, 2086 
2. Seollal / Korean New Year Holiday : Wednesday, 13 February, 2086 
3. Seollal / Korean New Year Holiday : Thursday, 14 February, 2086 
4. Seollal / Korean New Year Holiday : Friday, 15 February, 2086 
5. Independence Movement Day : Friday, 1 March, 2086 
6. Children's Day : Monday, 6 May, 2086 
7. Buddha's Birthday : Monday, 20 May, 2086 
8. Memorial Day : Thursday, 6 June, 2086 
9. Liberation Day : Thursday, 15 August, 2086 
10. Chuseok / Midautumn Festival : Monday, 23 September, 2086 
11. National Foundation Day : Thursday, 3 October, 2086 
12. Hangeul Day : Wednesday, 9 October, 2086 
13. Christmas Day : Wednesday, 25 December, 2086 
And here are the 3 public holidays falling on a weekend:
1. Children's Day : Sunday, 5 May, 2086 
2. Chuseok / Midautumn Festival : Saturday, 21 September, 2086 
3. Chuseok / Midautumn Festival : Sunday, 22 September, 2086