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.
13 October 1965 was a Wednesday.
October 12, 1965, was on a Tuesday.
7th October 1965 was a Thursday.
October 2, 1965, was a Saturday.
October 22, 1965 fell on a Friday.
October 24th, 1965 fell on a Sunday.
October 31, 1965 fell on a Sunday.
October 16, 1965 fell on a Saturday.
It was a Thursday.
It was a Wednesday.
Friday
It was a Friday.