Sunday
September 11th can be on any day of the week
It was a Tuesday.
It was a Friday.
September 11 2001 was a Tuesday.
Sept. 11, 1930 was on a Thursday.
September 11 1955 was a Sunday
June 11, 1955, was a Saturday.
October 11, 1955, was a Tuesday.
July 11, 1955 fell on a Monday.
November 5th, 1955 was a Saturday.
The 11th of September 1958 was a Thursday.
Wednesday