Off-market buying: trading after 3: 00 on the same day, the transaction is T+2, that is to say, the transaction has been completed on the same day, the share will be determined on the second day, and the formal buying and holding will take place on the third day. Trading before three o'clock on the same day, the transaction is T+ 1. That is to say, the share is determined on the same day and officially bought and held the next day.

On-site purchase: purchase after 3 pm, complete the transaction, and hold it the next day; Deal before three o'clock that day, and hold it that day.