The current month refers to the contract concluded this month, which is also the main contract. If the month is definitely changed after delivery, such as delivery in March, it will be traded until April. The main contract now is 1804. As can be seen from the disk, a new contract will be changed after delivery every month.

In Shanghai and Shenzhen, the main companies in Shanghai and Shenzhen and the protector 1804 are at the same price, understand?