Define a period

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How many working days in year 2079?

Here is the detail of the calculation:

Because 2079 is not a leap year, it has 365 days.

Let's remove 52 saturdays and 53 sundays. It remains 260 days.

Now, let's remove 12 public holidays that do not fall during a weekend and we obtain 248 working days in 2079.

Here is the list of these 12 public holidays:

1. Seollal / Korean New Year Holiday : Wednesday, 1 February, 2079
2. Seollal / Korean New Year Holiday : Thursday, 2 February, 2079
3. Seollal / Korean New Year Holiday : Friday, 3 February, 2079
4. 삼일절 : Wednesday, 1 March, 2079
5. 어린이날 : Friday, 5 May, 2079
6. 석가탄신일 : Monday, 8 May, 2079
7. 현충일 : Tuesday, 6 June, 2079
8. 광복절 : Tuesday, 15 August, 2079
9. 추석 : Monday, 11 September, 2079
10. 개천절 : Tuesday, 3 October, 2079
11. 한글날 : Monday, 9 October, 2079
12. 성탄절 : Monday, 25 December, 2079

And here are the 3 public holidays falling on a weekend:

1. 신정 : Sunday, 1 January, 2079
2. 추석 : Saturday, 9 September, 2079
3. 추석 : Sunday, 10 September, 2079