Math Challenge March 8

Women have played many roles in history — often by challenging the idea that some fields are for men only! Amelia Earhart made aviation history by attempting to be the first woman to fly around the world in her Electra plane. Ms. Earhart never reached her final destination and her fate has remained a mystery.
At 20:14 GMT the Itasca received the last voice transmission from Amelia giving positioning data. The Itasca continued to transmit on all frequencies until 21:30 hours GMT when they determined that Amelia must have ditched at sea and began to implement search procedures
Question: What time was it in New York when Ms. Earhart made her last voice transmission?