Buy funds on Friday and sell them on Sunday. The trading point of the fund is working day 15. Most funds confirm their shares at T+ 1, while some QDII funds confirm their shares at T+2 and inquire about their shares at T+3.

If you buy before the trading day 15 and confirm the next trading day, that is to say, you can't confirm the share until next Monday, then you can't sell it on Sunday. If the fund share has been purchased before, the previous fund share will be sold. If you buy after the trading day 15, the confirmed share will increase by one day, and the same is true.