How to determine the exact date of production of the Xiaomi phone: all the ways

When you buy a Xiaomi smartphone, new or used, the date of production can tell you a lot about the state of the device, which depends on how long the battery will last, whether the firmware is relevant and whether you will not encounter hidden defects after the warranty period. But how to know the exact release date if the phone does not have one in the settings?

In this article, we'll look at all the official and alternative methods, from serial number verification to box marking analysis, how to decipher production code, where to look for hidden labels, and why some methods can give inaccurate results, and we'll also explain why the date on the box and in the system sometimes don't match - and what to do about it.

1. Verification of production date by serial number (IMEI/SN)

The most reliable way is to use a serial number (SN) or IMEI, which is unique to each device and contains encrypted information about the build date.

• 📱 In settings: Settings → The phone. → General information → Serial number.
• 📦 On the box (barcode sticker)
• 🔋 Under the battery (for models with a removable lid, for example, Redmi) 4A)
• 📋 On a check or a security card

Xiaomi serial number usually has a format XXXXXXXXXYYWW, where:

• YY is the last two digits of the year (e.g. 23 = 2023)
• WW – week of production (01 to 52)

An example of a decryption: if the serial number ends in 2235, then the phone is released in Week 35 of 2022 (August 2022).

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If the serial number starts with letters (e.g. MZB), ignore them – the date is encrypted only in the digital part.

2. How to find out the date by box or sticker

The original Xiaomi packaging always has a barcode sticker and technical information.

• 📅 Manufactured Date or Date of Manufacture – a clear date in the format YYYY-MM-DD
• 🔢 S/N (serial number - decrypted by the method from the first section
• 🏭 Made in... + Plant code (e.g. Made in India with labeling) IN)

Attention! The date on the box may be 1 to 3 months different from the actual date of production of the phone. This is normal: the package is printed in advance, the device is assembled later. If the difference is more than six months, it is possible forgery or repackaging.

3. Verification through MIUI system settings

In the firmware MIUI there is no direct indication of the date of production, but you can find indirect signs:

1. Open the settings → About the phone → version of MIUI.
2. Click multiple times on the kernel version (or build number) to unlock Developer Mode.
3. Back to Settings → Additionally. → For developers.
4. Find the Build Date, which is the firmware compilation date, which is usually close to the production date.

Method limitation: The firmware build date can be updated when the system is upgraded, so it doesn't always match the phone's release date. For example, on the 2021 Redmi Note 10 Pro, after upgrading to MIUI 14 in 2023, the build date will show 2023, even though the device itself is older.

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4. Online services for checking the date Xiaomi

There are specialized sites that decrypt Xiaomi serial numbers and show the date of production.

• 🌐 IMEI.info - enter IMEI or SN, The service will show the date and country of production.
• 🌐 Mi-Code – Xiaomi serial number databases with code decryption.
• 🌐 SNDeepInfo supports most Redmi models, POCO mi.

Importantly, some services may not show an accurate date for new models (2023-2026) because their databases are updated with a delay.

Take a photo of the serial number from the box and phone|Check the match. SN both-source|Use 2-3 services for cross-checking|Compare the result with the date in the settings MIUI-->

5. Physical examination of the phone: where else to look for the date

If you already have your phone, check it for hidden labels:

• 🔋 Under the battery (for models with a removable lid, for example, Redmi) 5A or Mi A1) — There may be a date sticker in the format YYYY-MM-DD.
• 📱 Under SIM-tray – sometimes there is a duplicate serial number or batch code.
• 🔧 On the motherboard (visible when disassembling) - look for engraving of the form 2023.04 or W23.15 (Week 15, 2023).

⚠️ Warning: Disassembling the phone to check the date on the board will void the warranty if the device is warranty serviced. Use this method only for used devices or if you are confident in your skills.

On some models (e.g. POCO X3 Pro or Redmi Note 11), the production date may be listed on the test menu to get there:

1. Open the Phone app.
2. Enter the combination: ##4636###.
3. Go to the Device Information tab.
4. Look for Manufacture Date or Hardware Info.

6.Why the dates on the box and in the system may not match

The difference between the date on the box and the actual date of production of the phone is a common occurrence.

• 📦 Packaging is printed in advance – boxes are produced in batches 2-3 months before the assembly of phones.
• 🔄 Repackaging – some sellers replace boxes (especially in the used market).
• 🏭 Different parts – the phone could be assembled later than indicated on the box.
• 📱 Update of firmware - Assembly date MIUI Changes in upgrades, but does not reflect the actual age of the device.

How do you know which date is right?

1. Serial number (SN) from the phone body.
2. Date on the sticker under the battery (if any).
3. Data from online services (IMEI.info, SNDeepInfo).
4. The date on the box is only if it matches other sources.

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If the difference between the dates on the box and the serial number exceeds 3 months, this is a reason to doubt the originality of the device or its storage conditions.

7 What to do if the production date is suspicious

If the check showed that the phone is much older than stated by the seller, or the dates are very different, act on the algorithm:

1. Check the originality: 🔍 Compare. IMEI on the box and in the settings (Settings) → The phone. → General information → IMEI). 🛡️ Use Mi Verify to authenticate your identity.
2. Evaluate battery status: 🔋 Enter the code #4636 in the test menu## → Battery information → Check the wear level. 📊 Install AccuBattery app for detailed diagnosis.

Request the papers.

• 📄 Check the warranty card – the date of sale should be logically linked to the date of production.
• 💰 If you buy used, ask for a check or service history.

⚠️ Note: Xiaomi phones older than 2-3 years are often sold with a swapped battery or firmware.If the date of production is 2019-2020, and the seller claims that the battery is “like new”, this is a reason for additional checks.

FAQ: Frequent questions about Xiaomi's production date