6 Jan 1980 was a Sunday.
Monday.
January 6 (of the following year).
Windows built-in calendar says it was a Wednesday.
Consider this. Start on January 9th, and count back the years and leap days (12), and you have 16859 days. 16859 mod 7 = 3, and 9 - 3 = 6, and the 6th was a Wednesday.
January 6, 1980 was a Sunday
It was a Friday.
January 6, 1945 fell on a Saturday.
January 6, 2055 will fall on a Wednesday.
Number 96 - 1980 Father's Day 1-6 was released on: USA: 2 January 1981
6 November 1980 was a Thursday.
December 6, 1980 was a Saturday.
6 Jan 1980 was a Sunday.
In 1980, Easter Sunday fell on April 6.
January 6, 1967, was a Friday.
January 6 1917 was on a Saturday.
6 January 1965 was a Wednesday.