Question 1

How many days does December 1980 have?

Accepted Answer

December 1980 has 31 days. It starts on Monday and ends on Wednesday.

Question 2

What ISO week does December 1980 start in?

Accepted Answer

1 December 1980 falls in ISO week 49. Weeks run Monday–Sunday per ISO 8601.

Question 3

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

Accepted Answer

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

12월 1980