The SPXW symbol appears to be trading in the EST time zone, but its first trade of the day is at 10:31 am. Should this not be 9:31 am? At first, I was thinking it would be in CST due to the exchange location, but 10:30 CST is not when the exchange opens either. Can someone provide clarification on this issue? If you look at the backtest, you can see the first trade is at 10:31. However, for the SPX it should be 9:31.