The last delivery date refers to the time limit for stopping delivery.
The last trading day refers to the last trading day of the futures contract in the delivery month. The final trading day of the contract must be settled by spot, financial instruments or according to the agreement of futures contracts. After this trading day, the open contract must be delivered in kind or in cash according to the regulations.
Delivery date: refers to the date when both parties agree to exchange money. Generally, there are stock delivery date, futures delivery date and stock index futures delivery date. As far as futures contracts are concerned, the delivery date refers to the date when the goods must be delivered. If you don't want to make delivery, you must close the futures contract before the delivery date or the last trading day.