NASA officials had cautioned that it was just a tentative date.
NASA chief Sean O'Keefe has told a House panel that the next space shuttle flight will likely be delayed. It had been tentatively set for September.
NASA officials have repeatedly said that the fall launch schedule was "at the earliest" and that delays could happen as the agency recovers from the "Columbia" disaster.
O'Keefe didn't specify how long any delay might be, but he says the next best conditions for a daylight launch happen in January and March of next year.
Last week, a Columbia investigator warned of the danger of making another launch before safety repairs and other precautions were taken.