Question 1

How many days does September 1980 have?

Accepted Answer

September 1980 has 30 days. It starts on Monday and ends on Tuesday.

Question 2

What ISO week does September 1980 start in?

Accepted Answer

1 September 1980 falls in ISO week 36. Weeks run Monday–Sunday per ISO 8601.

Question 3

Where can I see the public holidays of Ireland in September 1980?

Accepted Answer

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