December 12, 1989 fell on a Tuesday.
December 12 can fall on any day of the week.
October 12, 1989 fell on a Thursday.
November 12, 1989 fell on a Sunday.
December 12 1947 was a Friday.
December 12 2010 was a Sunday.
December 12, 1990 was a Wednesday.
December 12 1958 was a Friday.
June 12, 1989 fell on a Monday.
Monday
It was a Sunday.
It was a Saturday.
It was a Tuesday.