Thursday. Check out the related link I added.
January 9, 1986 fell on a Thursday.
October 9 1983 was on a Sunday.
October 9 1940 was a Wednesday.
October 9, 1949 was a Sunday.
October 9 2010 was a Saturday.
9 October 1958 was a Thursday.
October 9 1993 was a Saturday.
It was a Monday.
It was a Sunday.
May 9th 1986 was a Friday.
October 9, 1995 fell on a Monday.
October 9, 2004 fell on a Saturday.