Although scientists have basically cleared us from any danger from asteroid 2002 NT7, which originally had been reported as an impact hazard for the year 2019, a newer space rock has been spotted, which may pose a threat even sooner.
At around 1.2 km in width, 2003 QQ47 is substantially smaller than 2002 NT7 (2km), but has been called "an event meriting careful monitoring" by astronomers.

If an impact does occur, it could be on March 21, 2014.

[link to space.about.com]


MASSIVE ASTEROID Possible Collision with Earth March 21, 2014

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