Futures in China are in a cycle every other month. It is to list all or part of the months of each year, and the next year will be the same as this year, so that it will cycle every year.
So each listed variety is variety name+year+month.
For example, the date of aluminum in 2020 165438+ 10 is the name of the variety, and the code is written as "al20 1 1".
Other varieties are similar.
The same is true of stock index futures.