How to change the date and time on Xiaomi Redmi 9: all the ways (including hidden)

Why Redmi 9 is getting a date and how to fix it

Owners of Xiaomi Redmi 9 often face a situation where the smartphone shows the wrong date or time – for example, after a battery change, reset or update MIUI. The reasons can vary from a banal failure of synchronization with the network to hardware problems with the RTC module (real time), in most cases, you can fix this yourself without resorting to a service center.

It is important to understand that the wrong date affects not only the display of time in the status bar. It can disrupt the work of banking applications (for example, SberBank or Tinkoff will refuse to open), cause errors in messengers (WhatsApp, Telegram), and also prevent the installation of certificates or update applications through Google Play. If your Redmi 9 shows 2015 or resets time after a reboot, this is a signal to action.

In this article, we will discuss all the current ways to change the date and time, including manual settings, network synchronization, as well as hidden methods through the engineering menu and ADB. Separately, we will dwell on the typical mistakes that users make when changing the date, and explain how to avoid repeated failures.

Method 1: Standard Date and Time settings via menu

The easiest and safest method is to use built-in settings. MIUI. It will work if the date is lost due to a temporary failure or after replacement. SIM-Here's how to do this:

1. Open “Settings” (the gear icon on the desktop or in the application menu).
2. Go to the section Additional settings → Date and time.
3. Turn off the date and time autodetection slider (if it is active).
4. Click on the Set a date and select the current date in the calendar.
5. Similarly, set the time in the Set time field.
6. Go back and enable Autodetermination if you want to sync with the network.

If you're going to get your date down again, you're going to have a deeper problem, maybe an RTC module is broken, or you're going to have a conflict of network settings, and then you're going to go to the next thing.

Turn off mobile internet and Wi-Fi

Check the battery charge (minimum 30%)

Make sure that SIM-map inserted correctly

Reboot your smartphone before changing your settings-->

Method 2: Network date synchronization (if autodetermination doesn’t work)

Often Redmi 9 can't automatically update the date because of problems with NITZ (Network Identity and Time Zone), a protocol that transfers time over an operator's network. If the AU slider is on but the date is still incorrect, try:

1. Turn off date and time autodetermination in the settings.
2. Manually set the correct date and time (as in Method 1).
3. Go to Settings. → SIM-maps and mobile networks.
4. Choose yours. SIM-map and press Access Points (APN).
5. Click on the three dots in the top right corner and select Reset APN settings.
6. Return to Date and Time and enable Autodetermination.

If the synchronization still doesn’t work, the problem may be on the operator’s side, in which case contact support (for example, through the My MTS or My Beeline app) and check if technical work is underway.

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If the APN reset still gets lost, try manually adding an access point with your operator's settings. APN settings can be found on the official website of MegaFon, Beeline or Tele2.

Method 3: Reset network settings (if the date is lost after the reboot)

If Redmi 9 shows the correct date, but after every shutdown or restart, it resets it to the factory (for example, January 1, 2020), the fault in the network settings will help reset network parameters:

1. Open the Settings. → The phone.
2. Press the MIUI version 7 times to activate the developer mode (if not already activated).
3. Return to the main settings menu and select Additional settings → Reset.
4. Tap Reset Network settings and confirm the action.

After reset, the smartphone will restart, and the date should update automatically. If the problem persists, move to the method with the engineering menu.

⚠️ Warning: Network reset will delete all stored Wi-Fi passwords and Bluetooth settings. Write down important data in advance!

Method 4: Change the date through the engineering menu (for power users)

If standard methods fail, you can try changing the date through the Engineering Mode, which requires caution, as wrong actions can disrupt the smartphone.

Instructions:

1. Open the phone app and enter the combination: ##4636##
2. In the menu that opens, select Phone Information.
3. Scroll down to the Set Time block.
4. Enter the date and time in the format YYYYMMDD.HHMMSS (for example, 20260515.143000 for May 15, 2026, 14:30:00).
5. Press Set and restart the device.

If #4636### doesn’t work, try the alternative code.

##36446337##

Engineer Mode MTK

Redmi 9

Method 5: Date Correction via ADB (for advanced users)

If all previous methods failed, the last chance is to use Android Debug Bridge (ADB), which requires a computer and basic command line knowledge.

1. Download and install ADB Tools on PC.
2. On your smartphone, activate Developer Mode (7 taps according to the MIUI version in About Phone).
3. Enable USB Debugging in Settings → Additional settings → For developers.
4. Connect Redmi 9 to your computer via USB (select File Transfer mode).
5. Open the command line (Windows) or the terminal (macOS/Linux) Enter adb shell su date -s YYYYMMDD.HHMMSS Replace. YYYYMMDD.HHMMSS on the current date and time (for example, 20260515.143000).
6. Reboot your smartphone with the reboot command

Important: If you enter the su command and you have a "Permission denied" error, you have no root permissions on your device. ADB-The method will not work without additional manipulations (unlocking the bootloader and obtaining root rights).

⚠️ Attention: Use ADB root rights can cause a loss of warranty and system failure. Use this method only if other methods have not helped!

Table: Causes of date failure and ways to fix them

Frequent Date Change Errors on Redmi 9 and How to Avoid Them

Many users make the same mistakes when trying to fix a date on their smartphones, and here are the most common ones and ways to prevent them:

• 🔄 Ignoring reboots after changing the date through the engineering menu or ADB Many forget to restart the device. Without a reboot, the changes may not take effect.
• 📶 No network when autodetermining. If Autodetermining is enabled but the smartphone is not connected to a mobile network or Wi-Fi, synchronization will not occur.
• ⚡ Low battery power: At a charge level below 15%, the system can block date changes to avoid errors in a sudden shutdown.
• 🔧 Use of informal firmware. ROM (For example, LineageOS, standard methods may not work.

Another common mistake is trying to change the date through Google Account. On Redmi 9, this is impossible: sync with Google only applies to contacts, calendar and certain settings, but not system time.

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If the date is knocked down regularly (once a week or more), the problem is more hardware than software, and 80% of the time it is a dead battery or a faulty RTC controller on the motherboard.

FAQ: Answers to Frequent Questions About Changing Date to Xiaomi Redmi 9