Pre-market and after-hours trading quote update period

U.S. Pre and Post-Market Quote Update Session:
Pre-Market(ET): 4:00~9:30
After-Hours (ET): 16:00~20:00
The Pre and Post Quote are ranked by the latest data, when not in the update period, it will display the latest market quote.
 
Note: The T represents a particular trading day, the T-1 is the previous trading day.
 
Time(ET) Pre-Market After-Hours
0:00~4:00 (Close) T-1 T-1
4:00~9:30 (Pre-Market) T T-1
9:30~16:00 (Regular Trading Hours) T T-1
16:00~20:00(After-Hours) T T
20:00~24:00(Close) T T
 
For non-trading days, the most recent quote available on the most recent trading day will be used.