According to the online edition of the old farmers almanac:
http://www.almanac.com/rise/results.php?what[]=Sun&what[]=Moon&month=9&day=18&year=2010&usamap.x=398&usamap.y=99&zipcode=&place=New+York+City&state=NY&searchtype=map
The sun will set at about 7:05
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On September 18, 2010, in New York City, sunrise will be at 6:39 AM Eastern Daylight Time, and sunset will be at 7:01 PM EDT.
For more sunrise/sunset times for all the world's major cities, see the Related Link below.
Sundown on September 18, 2010, in New York City would have occurred around 7:01 PM EDT.