Nasdaq plans to extend U.S. stock trading hours to nearly 23 hours starting December 6, with the after-hours session directly overlapping with Asian trading hours. The newly introduced overnight trading window will run from 9:00 PM to 4:00 AM Eastern Time, which corresponds to 10:00 AM to 5:00 PM Hong Kong and Beijing time during the U.S. winter time (Standard Time), directly overlapping with mainland China's regular trading hours.