> On what day did 9/11 happen?

On what day did 9/11 happen?

Posted at: 2015-04-20 
Wow, really? Hahahaha.

9/11

September 11, 2001

The DAY was a Tuesday. The DATE was 9-11-2001.

The 9th month is September. So., 9/11 happened on September 11.

Tuesday, September 11th 2001

Good joke

The answer is in your question.