What does it mean to change the moon?
Changing the month is for futures contracts. Generally speaking, futures contracts are forward contracts, so buyers and sellers have to pay on the due date. Of course, for people who speculate in futures, they operate in this venue to earn the difference, so they don't participate in the final delivery. In this regard, the operation of changing the month appeared, speculators re-traded through changing the month, and deliverymen continued to lock in the future through changing the month.
We can see an obvious phenomenon in futures contracts, that is, futures contracts are often XX2007 or something, and their codes are completely different from stock codes. In this regard, XX2007 represents the contract in July 2020, which will be delivered after the contract expires, so investors originally in XX2007 will switch to next month.
To sum up, this is changing the month, that is, changing the month.