I will tell you the last trading day. After all, this is the key. After the last trading day, delivery will be made.
Last trading day (e.g. May contract)
Shanghai Futures Exchange delivery month 15 05 15 (the last trading day of the month before the delivery month of fuel oil contract 0430).
10th trading day of contract delivery month of Dalian Commodity Exchange 05 15
The tenth trading day of the delivery month of 05 15 contract in Zhengzhou Commodity Exchange is quite special (WS WT ER is different).
The third Friday of the contract delivery month of China Financial Futures Exchange
And so on, according to the position month.
Generally, you only need to know the last trading day, and then you will enter the delivery after opening the position.
If you participate in the delivery, it will involve the delivery date. This variety is different. If you need to know, please see the communication.