It was a Tuesday.
Christmas fell on a Tuesday in 2001. Therefore, a weekday.
September 11th 2001 fell on a Tuesday.9-11-01 took place on a Tuesday.
September 4th, 1947 fell on a Thursday.
March 11th, 2001 fell on a Sunday.
September 11th, 1992 fell on a Friday.
September 11th, 1972 fell on a Monday.
September 11th, 1958 fell on a Thursday.
September 4th, 2001 fell on a Tuesday.
September 13, 2001 fell on a Thursday.
September 24th, 2001 fell on a Monday.
The third Monday of September 2001 fell on September 17.
September 11th, 2003 fell on a Thursday.