It was a Tuesday.
September 11 2001 was a Tuesday.
September 11th can be on any day of the week
It was a Friday.
Sept. 11, 1930 was on a Thursday.
The 11th of September 1958 was a Thursday.
August 11 2001 was a Saturday.
11 June 2001 was a Monday.
September 11, 2001 was a Tuesday.
July 11, 2001 was on a Wednesday.
September 11th, 2003 fell on a Thursday.
Tuesday, September 11, 2001 was the day of the attacks.