Friday
It was a Wednesday.
From a US perpetual calendar: August 9, 1942 was on Sunday.
May 9 was a Saturday
May 9 1947 was on a Friday.
May 9 1955 was on a Monday.
May 9 1920 was a Sunday.
May 9 2000 was a Tuesday.
9 May 1945 was a Wednesday.
May 9 1950 was a Tuesday.
May 9 2010 was a Sunday.
May 9, 1971 was a Sunday.