US Eastern Time (EDT): Monday to Friday 9:30 - 16:00
US Daylight saving time - summer: Beijing time (21:30 - 4:00)
US Daylight saving time - winter: Beijing time (22:30 - 5:00)

Additional information:
Each year from April to early November, the trading hour is from 9:30 pm to- 4:00 am into the next day
And in early November to early April, the trading hour is from 10: 30 pm to 5:00 am into the next day