October 31, 1965 fell on a Sunday.
31 January 1965 was a Sunday.
31 December 1965 was a Friday.
August 31, 1965 was a Tuesday.
October 1965 holds a range of 31 days and you have failed to say which specific one you are interested in. The 1st October 1965was a Friday. This will allow you to work out the specific day you wish to.
31 October 2001 was a Wednesday.
31 October 1994 was a Monday.
31 October 2006 was a Tuesday.
31 October 2004 was a Sunday.
October 31, 1979 was a Wednesday
October 31 1952 was a Friday.
October 31 1945 was a Wednesday.
October 31, 1997 was a Friday.