Effective (pending CFTC approval) April 8, 2013. The new hours will be:
Sunday to Friday, electronic trading from 7:00 p.m. to 7:45 a.m. CT
Monday to Friday, break in electronic trading from 7:45 a.m. to 8:30 a.m. CT
Monday to Friday, floor and CME Globex trading from 8:30 a.m. to 1:15 p.m. CT