Question 1

How many days does May 1980 have?

Accepted Answer

May 1980 has 31 days. It starts on Thursday and ends on Saturday.

Question 2

What ISO week does May 1980 start in?

Accepted Answer

1 May 1980 falls in ISO week 18. Weeks run Monday–Sunday per ISO 8601.

Question 3

Where can I see the public holidays of South Korea in May 1980?

Accepted Answer

The calendar on this page marks every national public holiday of South Korea in May 1980 in red, with joint/regional days in amber.

5월 1980