A stock can not be sold until the next day after it is bought on the same day, but it is ok to buy it after it is sold on the same day, because after the stock is sold, the funds become available, and you can buy any stock at this time. Of course, this range also includes stocks sold.

Funds are bought through the securities market: bought on the same day and sold the next day. Buy through the fund company website or bank counter: buy on the same day and sell on the third day. Because you want to sell, at least wait for the fund to be confirmed successfully, and you can only sell if you have a share. According to the regulations of the fund company, the confirmation time is T+2 days.