To calculate the expiration date of JD.com's shipments, you first need to know the shelf life of the product. Generally, the shelf life refers to the time that the product can maintain its original quality and safety under certain conditions. JD.com's delivery time is generally 1-2 working days after the order is placed, and the delivery time depends on the region and logistics conditions. If it is assumed that the shelf life is 180 days from the date of production of the product, you can follow the steps below to calculate the expiration date of JD.com's shipments:

1. Find the production date of the product: Some products will have the production date marked on the packaging. If there is no mark, you can try to check the batch number on the product packaging and obtain the production date information by contacting JD.com customer service or the product brand manufacturer.

2. Calculate the expiration date of the shelf life: Add the production date and the shelf life to get the expiration date of the shelf life.

3. Determine the purchase date: The date of ordering from JD.com is used as the purchase date.

4. Calculate the remaining days of the delivery shelf life: subtract the purchase date from the expiration date to get the remaining days of the delivery shelf life. According to the above steps, you can get the time when the JD delivery shelf life is about to expire. Please note that because the delivery and distribution time may change, it is best to consider the shelf life of the goods a few days in advance so that the goods can be consumed or stored in time.