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How many working days in year 1990?

Here is the detail of the calculation:

Because 1990 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 1990.

Here is the list of these 13 public holidays:

1. New Year's Day : понедельник, 1 январь, 1990
2. Seollal / Korean New Year Holiday : пятница, 26 январь, 1990
3. Independence Movement Day : четверг, 1 март, 1990
4. Buddha's Birthday : среда, 2 май, 1990
5. Children's Day : понедельник, 7 май, 1990
6. Memorial Day : среда, 6 июнь, 1990
7. Liberation Day : среда, 15 август, 1990
8. Armed Forces Day : понедельник, 1 октябрь, 1990
9. Chuseok / Midautumn Festival : вторник, 2 октябрь, 1990
10. Chuseok / Midautumn Festival : среда, 3 октябрь, 1990
11. Chuseok / Midautumn Festival : четверг, 4 октябрь, 1990
12. Hangeul Day : вторник, 9 октябрь, 1990
13. Christmas Day : вторник, 25 декабрь, 1990

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

1. Seollal / Korean New Year Holiday : суббота, 27 январь, 1990
2. Seollal / Korean New Year Holiday : воскресенье, 28 январь, 1990
3. Children's Day : суббота, 5 май, 1990