It is proper to display the U.S. flag from sunrise to sunset on all days the weather permits. The flag may also be displayed at night if illuminated by a light.
On December 18, 2001 President Bush signed Public Law No. 107-89 designating Patriot Day as September 11 to honor the individuals who lost their lives as a result of the terrorist attacks. People of the United States are also asked to observe a moment of silence on that day in remembrance of the victims.
In accordance with a Presidential Proclamation dated December 6, 2002 and Public Law 103-308 as amended by Congress.