Where can I check the activation date of Xiaomi mobile phone?

Xiaomi identifies the production date of the mobile phone by the SN number on the box of the mobile phone to check the activation date of the mobile phone. By checking the authenticity of the serial number in official website, you can know the expiration date of the warranty period of the mobile phone. The warranty period MINUS one year is equivalent to the activation time of the mobile phone. Search Xiaomi official website, log in to the account, find the manual customer service, enter the mobile phone you want to query, enter the activation date in the pop-up dialog box, click the manual customer service, and the customer service will truthfully inform the mobile phone activation date. There is a row of numbers on the QR code in the mobile phone box, which is the SN number of the mobile phone. Generally refers to the serial number of the product when it leaves the factory. You can check the mobile phone version, place of origin, production date and so on. On the official website.