In order to facilitate the analysis, the general futures market software will display the futures contracts of the same month in different years.

For example, the Qiangmai xx09 contract will show the contract in September each year. In 2003, the 0409 contract was displayed, which was the contract in September 2004. After the contract is delisted, the 0509 contract will be displayed next, and so on. Now the 0909 contract is displayed.

I wonder if I made myself clear.