September 11 is the 254th day of the year (255th in leap years). There are 111 days remaining.
It is usually the first day of the Coptic calendar (in the period 1900 to 2099 A.D.).
The terms "September 11" and "9/11" have been widely used in the Western media as a shorthand for the September 11, 2001 attacks on the World Trade Center and Pentagon in the United States.
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September 10 · September 12 · August 11 · October 11 · more historical anniversaries
See also: January, February, March, April, May, June, July, August, September, October, November, December - more historical anniversaries