How to check the release date of Xiaomi device: from smartphone to smart watch

Have you bought a used Xiaomi Redmi Note 12 or Mi Band 8 and want to make sure that the seller did not hide the real age of the device? Or are planning to buy new equipment but doubt the integrity of the store? Xiaomi release date is not just numbers: it depends on the warranty period, the relevance of the firmware and even the residual battery life. In this article, we will discuss 7 working ways to find out the exact date of production of any device of the brand – from flagship smartphones to budget smart lamps.

It is important to understand that Xiaomi does not have a single standard for marking all lines, for example, the date in the serial number Redmi and the name of the product. POCO It's coded differently than the Mi or Black Shark, and we've put together current decryption schemes for 2026, including nuances for devices released after the company rebranded. You will also learn which two digits in the serial number never match the real year of release – this trick is used by scammers in the secondary market.

1.Serial Number: The Main Source of Truth

Serial number (S/N) — It's a unique device identifier that contains encrypted information about the date of production. 11–14 symbolism:

• 📦 Box (on a barcode sticker)
• 📱 The device itself (under the battery, on the SIM-slot)
• 🔋 Battery (for smartphones with removable back cover)
• ⚙️ In system settings (Settings) → The phone. → General information)

The serial number format depends on the year of production and model.

⚠️ Attention: On devices POCO And Black Shark, until 2022, can be encrypted in reverse order. XM210711**** means July 11, 2021, not 2021, 7 months, 11th.

Find S/N on the box or in the settings

Contrast the format with the table above

Decipher the year and week/month

Check the date match with the firmware version-->

2.Date of production by IMEI: myths and reality

Many users mistakenly believe that IMEI It contains the release date information, IMEI (The international mobile device identifier is designed to identify the device on the network and does not store data on the date of production:

• 🔍 First 8 digits (TAC-code) indicates the model and series of the device, and IMEI.info gives the approximate year of the start of sales of the model.
• 📅 If your Xiaomi has IMEI, Starting with 86 (China), the probability of counterfeiting is higher - check the date by other methods.
• ⚙️ In settings (On the phone) → Status SIM) The date of the first activation may be displayed, but it is easy to fake.

Example: IMEI 863547041234567 refers to the Redmi Note 10 Pro model released in 2021.This means the device may not be newer than 2021, but the exact production date is IMEI won't show.

By serial number.|Po Po Po IMEI|Box and complete.|Firmware and settings|Not checking.-->

3. Marking on the box: what the stickers hide

The original Xiaomi box contains several key tags that can be used to determine the release date.

1. Date of production on barcode sticker (format) YYYY/MM/DD or YYMMDD). For example, 220515 = 15 may 2022 year-end.
2. The batch code is usually 4-6 digits, where the first two denote a year, the next one is a week.
3. Manufacturer: If the name is “Made in India” or “Made in Indonesia” and the seller claims that the device is from China, it is a reason to doubt.

⚠️ Note: Fake boxes often have a date that doesn't match the actual age of the device. 9A You can have a date of 2023, although production of this model ended in 2021. Always check the data from the box with the serial number of the device!

4. Software methods: what will tell the firmware

If physical methods did not help, the release date can be determined by the firmware version and the date of assembly. MIUI. For that:

1. Go to Settings → About Phone → MIUI version.
2. Click 7-10 times on the line with the version to activate the developer mode.
3. Back to Settings → Additionally. → For developers and find the item Assembly Date.

Format of the assembly date: YYYYMMDD. For example, 20231015 = 15 October 2023 Please note that:

• 🔄 The firmware assembly date may be newer than the device’s manufacturing date (if the firmware has been updated).
• ⏳ On budget models (Redmi) A1, POCO C50) The difference between the date of assembly and release can reach 3-6 months.
• 🚫 If the build date is older than the activation date of the device, it is a sign of counterfeit or “gray” import.

For accuracy, check the build date with the build number, V14.0.4.0.TKUCNXM contain:

• V14 — version MIUI (14)
• CN — region (China)
• XM — Model code (may indicate the release date)

adb shell getprop ro.build.date.utc

It will return timestamp, which can be converted to a date on sites like Epoch Converter.-->

5. Online services for verification: which are working in 2026

There are several reliable services to check the release date of Xiaomi by serial number or IMEI. We tested them and selected the best ones:

🔍 How to use it:

1. Enter the serial number or IMEI on selected service.
2. Compare the date received with data from other sources (box, firmware).
3. If the service gives an error "Device not found", check the correct input. S/N Or try another resource.

⚠️ Note: new.c.mi.com may show the date of first activation rather than production. For example, if the smartphone was in storage for 6 months, the difference will be six months!

💡

The most accurate results are given by a combination of 3 methods: serial number. + box-date + Checking through the official Xiaomi service.

Physical examination: what gives the age of the device

If you have the device on your hands, pay attention to indirect signs that may indicate its age:

• 🔋 Battery status: C Settings → Battery → Battery status check the charging cycle. If the value is greater than 300-500, the device is longer than 1-2 years.
• 📸 Camera: on older models (Redmi Note 5, Mi 8) over time appears purple shade in the photo in low light.
• 🛠️ The case: devices 2018-2020 (Mi 9, Redmi) K20) Oleophobic screen covering is often erased.
• 🔊 Dynamics: on models older than 3 years, the maximum volume can sag due to wear of the membranes.

For smartwatches (Mi Band, Xiaomi Watch) and fitness bracelets, pay attention to:

• 💡 Screenlighting: Older models (Mi Band) 3/4) fade away.
• 🔋 Working time: if the bracelet keeps the charge less than 3-4 days, it is more than 2-3 years.
• 🔄 Firmware: on Mi Band 5 and older, the last update date is displayed in the Mi Fitness app.

📌 Tip: Take a picture of the device from different angles and compare it to the official images on Xiaomi's website. Fraudsters often sell old models under the guise of new ones, replacing only the back cover.

7. Features for different types of Xiaomi devices

The methods of checking the release date may vary depending on the type of equipment.

🔹 For smartphones. POCO: use the service POCO Official Verify: This shows the activation date, which is usually 1-3 months after the production date.

🔹 For smart devices (Xiaomi Smart Home): Release date is often listed in the Mi Home app in the Device section → Settings → General information.

FAQ: Frequent questions about Xiaomi release date