It was a Thursday.
23 January 1965 was a Saturday.
June 23, 1965 was a Wednesday.
December 23, 1965 fell on a Thursday.
23 September 1928 was a Sunday.
23 September 1908 was a Wednesday.
23 September 1936 was a Wednesday.
September 23 1946 was a Monday.
September 23 1940 was a Monday.
September 23 1943 was a Thursday.
September 23 1945 was a Sunday.
September 23, 1955 was a Friday.
September 23 1974 was a Monday.