VIENNA- World powers and Iran are not discussing extending a late November deadline for reaching an agreement over Tehran's nuclear program, a senior U.S. official said today, adding there was still time to reach a deal.

The State Department official spoke ahead of a meeting between U.S. Secretary of State John Kerry, Iranian Foreign Minister Mohammad Javad Zarif and European Union foreign policy chief Catherine Ashton in Vienna.

"We're not talking about extension or anything like that in the room. We're talking about getting this done by November 24," the U.S. official said.

Iran and the six major powers aim to end a decade-old dispute over Tehran's nuclear program by reaching a settlement to curb the country's atomic activities in exchange for a lifting of sanctions hurting its oil-dependent economy.