Question 1

How many days does January 1990 have?

Accepted Answer

January 1990 has 31 days. It starts on Monday and ends on Wednesday.

Question 2

What ISO week does January 1990 start in?

Accepted Answer

1 January 1990 falls in ISO week 1. Weeks run Monday–Sunday per ISO 8601.

Question 3

Where can I see the public holidays of Poland in January 1990?

Accepted Answer

The calendar on this page marks every national public holiday of Poland in January 1990 in red, with joint/regional days in amber.

styczeń 1990