Have you noticed that the clock on your Android smartphone has suddenly started to lag or rush? Or maybe the date is off by a few days, despite automatic synchronization being turned on? This problem occurs more often than it seems - from budget ones to flagship ones. The reasons may lie both in software failures and in the hardware features of the device. Xiaomi Redmi to flagship Samsung Galaxy And Google Pixel. The reasons may lie in both software failures and hardware features of the device.

In this article we will analyze all possible reasonswhy the clock on Android stops synchronizing - from trivial errors in the settings to deep system failures. You will learn how to check the operation of exact time servers (NTP), why a smartphone can “forget” the time zone after a reboot, and what to do if even manual settings do not help. And for the most difficult cases, we have prepared instructions for resetting the cache and diagnosing hardware faults.

Important: if the problem arose after updating Android or installing custom firmware, solutions may differ - we will also talk about this separately. Don’t rush to take your phone to a service center: in 90% of cases, time synchronization can be restored yourself in 5–10 minutes.

1. Checking basic date and time settings

The first thing you need to do is make sure that the correct time zone is selected on your phone. Even if you are sure that the settings have not been changed, the failure could have occurred after a system update or due to an application conflict. automatic synchronization is enabled and the correct time zone is selected. Even if you are sure that the settings have not been changed, the failure could have occurred after a system update or due to an application conflict.

Open Settings → System → Date and time (on some firmware the path may differ: Settings → General → Date and time). Check the following parameters:

  • ⏰ Automatic date and time —the slider should be active (blue/green).
  • 🌍 Automatic time zone selection —enable if disabled.
  • ⚙️ Time format —24-hour or 12-hour (does not affect synchronization, but can be confusing).

If automatic synchronization is enabled, but the clock is still lost, try manually select a time zone (turn off automatic selection and specify your city). Sometimes geolocation servers make mistakes, especially if you've recently traveled or are using a VPN.

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On some smartphones (for example, Huawei and Honor), the time settings may be hidden in the "Advanced" or "More" section. If you don’t find the item, use the search in the settings (magnifying glass icon at the top of the screen).

2. Failures of time servers (NTP)

Android synchronizes time with NTP servers (Network Time Protocol) - this is a global network of servers that provide accurate time. If the server your phone is connected to is unavailable or malfunctioning, syncing may stop. This happens especially often when:

  • 📶 Connecting to mobile networks with a poor signal (for example, in the subway or outside the city).
  • 🔒 Using a VPN or proxy that blocks access to NTP servers.
  • 🛡️ An active firewall or antivirus that limits network requests.

To check the operation of NTP:

  1. Disable the VPN (if are using).
  2. Switch from mobile data to Wi-Fi or vice versa.
  3. Manually specify an alternative NTP server (more on this below).

Most smartphones use a server by default time.android.com or regional servers (for example, ru.pool.ntp.org for Russia). If they do not respond, you can manually enter another address:

  1. Install the application ClockSync (free on Google Play).
  2. In the application settings, select a server from the list (for example, pool.ntp.org or time.google.com).
  3. Click "Synchronize" and check if the time has been updated.
📊 What mobile operator do you have?
MTS
Beeline
MegaFon
Tele2
Yota
Other

3. Conflicts with applications and services

Some applications can blocking the system's access to time servers, especially if they use aggressive methods of optimizing battery or network traffic. Most often, problems cause:

  • 🔋 Applications to save battery (Greenify, AccuBattery).
  • 🛡️ Antiviruses and firewalls (Avast, Kaspersky, NetGuard).
  • 🌐 VPN clients (NordVPN, ProtonVPN, 1.1.1.1).
  • 📱 Launchers and shells (for example, Nova Launcher or MIUI on Xiaomi).

To identify the culprit:

  1. Start the phone in safe mode (press the power button → "Safe Mode") In this mode, only system applications work.
  2. Check if the time is synchronized. If yes, the problem is in one of the installed applications.
  3. Disable suspicious apps one by one or remove them to find the culprit.

If the conflict is caused by a system application (for example, MIUI Optimization on Xiaomi), you may need to reset the settings or roll back the update. On some firmware (for example ColorOS from Oppo/Realme), disabling the "Deep optimization" function in the battery settings helps.

How to disable deep optimization on Oppo/Realme?

Go to Settings → Battery → Consumption optimization → Deep optimization and turn off the slider. After that, restart your phone.

4. Resetting the cache and data of Google services

System services are responsible for time synchronization on Android, including Google Play Services. If their cache or data is corrupted, it can cause the watch to malfunction. Clearing the cache is a safe procedure that will not delete your data, but will help restore correct operation.

Clearing instructions:

  1. Open Settings → Applications → All applications.
  2. Find Google Play Services (or Google Play Services).
  3. Click Storage → Clear cache.
  4. If that doesn’t help, go back and select Storage management → Clear all data (this will reset the service settings, but will not delete the account).

After cleaning, restart the phone and check the time synchronization. If the problem persists, repeat the procedure for the application Google Clock (if it is installed) and Time settings (may be called Date & Time in system applications).

Check for Google Play Services updates in the Play Market|Disable and re-enable automatic synchronization|Try a different NTP server|Reset network settings-->

5. Hardware problems and BIOS reset

If software methods do not help, the problem may lie in hardware failure. On some smartphones (especially budget models Samsung, Lenovo or Alcatel), there are defects in the microcircuit RTC (Real-Time Clock), which is responsible for tracking time when the power is turned off. Symptoms of hardware failure:

  • ⏱️ The phone clock gets lost only after a complete shutdown phone (do not reboot!).
  • 🔋 The date and time are reset to factory settings (for example, January 1, 2016).
  • 📱 The phone does not “remember” the time even after manual installation.

Unfortunately, it is impossible to replace the RTC chip at home - this requires soldering and specialized equipment. However, before visiting the service center, try reset BIOS settings (if your smartphone supports this function). This is relevant for devices with an unlocked bootloader or custom firmware.

To reset the BIOS:

  1. Turn off the phone.
  2. Hold down the button combination to enter Fastboot (usually Volume down + Power).
  3. Connect the phone to the PC and enter the command: 
    fastboot oem rtc_reset

    (for some models Qualcomm may be required fastboot oem rtc-poweroff).

  4. Reboot device.
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If after resetting the BIOS the time is still lost, this is almost guaranteed to be a hardware fault. In this case, only replacing the motherboard or RTC chip will help.

6. Features of firmware and custom ROMs

If you use custom firmware (for example, LineageOS, Pixel Experience or MIUI EU), the problem with time synchronization may be due to:

  • 📦 Lack of proprietary libraries Google Apps (GApps).
  • ⚙️ Incorrectly configured kernel or modules Magisk.
  • 🕒 Lack of NTP support in the firmware assembly.

Solutions for custom firmware:

  1. Install or update GApps. Download a suitable package (for example NikGapps or Open GApps) and flash through recovery.
  2. Check the kernel settings. In applications like Kernel Adiutor or FrancoKernel find the RTC parameters and enable NTP support.
  3. Use alternative servers. In the file /system/etc/gps.conf (or /vendor/etc/gps.conf) write: 
    NTP_SERVER=time.google.com

    XTRA_SERVER_1=http://xtra1.gpsonextra.net/xtra.bin
    

    XTRA_SERVER_2=http://xtra2.gpsonextra.net/xtra.bin
    

    XTRA_SERVER_3=http://xtra3.gpsonextra.net/xtra.bin

If you recently updated the firmware, try rolling back to the previous version - sometimes bugs are fixed over time in the next builds. Also check the developer forums (for example XDA Developers or 4PDA) - they may have already published a patch for your model.

📊 Do you use custom firmware?
Yes, all the time
Yes, I tried, but returned to stock
No, only official software
I don’t know what it is

7. Problems with the SIM card and operator

Many people don’t know, but mobile operators also transmit time data through the network. If your phone can't sync with NTP servers, it may be trying to get the time from your operator - and this sometimes leads to conflicts. Especially relevant for:

  • 📱 Old phones (up to Android 8.0), where NTP is not always stable.
  • 🌐 SIM cards with roaming or virtual operators (for example, Tinkoff Mobile, Yota).
  • 📶 Phones with two SIM cards from different operators.

To check the influence of the SIM card:

  1. Remove the SIM card and restart the phone. If the time is synchronized, the problem is with the operator.
  2. Call the operator and check if technical work is being carried out on their side (sometimes failures last for several days).
  3. Try to insert a SIM card from another operator and check the synchronization.

If the problem is confirmed, you can:

  • Disable time synchronization via the operator's network (in the SIM card or mobile network settings).
  • Use only Wi-Fi for synchronization (in NTP settings).
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On some phones (for example Samsung with One UI firmware) time synchronization via the mobile network disabled in the menu Settings → Connections → Mobile networks → Operator networks → Automatic time setting.

8. Extreme measures: reset to factory settings

If none of the methods helped, the only option left is complete phone reset. This is a radical solution, but it is guaranteed to eliminate software conflicts that could affect the operation of the watch. Before resetting:

  • 📲 Make a backup copy of your data (photos, contacts, messages).
  • 🔐 Make sure you remember the data from your Google account (authorization will be required after resetting).
  • 📋 Write it down or take a photo of important settings (for example, APN for mobile data).

Reset instructions:

  1. Open Settings → System → Reset → Delete all data (reset to factory settings).
  2. Confirm the action (you may need to enter a PIN code or pattern).
  3. After the reboot, set up the phone as new and check the time synchronization.

If the problem remains even after the reset, this is almost certain hardware failure. In this case, contact a service center - you may need to replace the RTC chip or diagnose the motherboard.

💡

Resetting to factory settings deletes all data from the phone, including applications and files in the internal memory. Memory cards (SD) and data in your Google account will remain intact.

FAQ: Frequently asked questions about time synchronization on Android

❓ Why does the clock only go astray at night?

This may be due to:

  • Battery saving - some firmware (for example, MIUI) aggressively optimize background processes at night, including time synchronization.
  • By switching to RTC backup power - if the battery is discharged to a critical level, the time chip can be reset.
  • Scheduled work with the operator or on NTP servers (rarely, but happens).

Solution: Disable night optimization in the battery settings or put the phone on charge before going to bed.

❓ Can an antivirus block time synchronization?

Yes, some antiviruses (for example, Avast, Dr.Web) block access to NTP servers, considering them “suspicious connections”. The problem may also be in:

  • Antivirus firewall (port 123, used by NTP, is blocked).
  • The "Network Protection" function, which scans all outgoing connections.

Solution: Add time servers (time.google.com, pool.ntp.org) to exclude antivirus or temporarily disable network protection.

❓ Why is the time lost after replacing the battery?

This is normal if:

  • The battery was completely discharged to 0% - the RTC chip is reset in the absence of power.
  • The technician disconnected the phone from power for a long time (more than 10-15 minutes) during the replacement.
  • A non-original battery with incorrect parameters is installed (rare, but happens with cheap analogues).

Solution: After replacing the battery, manually set the correct time and wait for the first automatic synchronization. If the problem persists, check the quality of the battery or contact a specialist.

❓ How to check if the RTC chip is working on my phone?

Simple test:

  1. Turn off the phone (not reboot!).
  2. Remove the SIM card and memory card (if any).
  3. Leave the phone turned off for 1-2 hours.
  4. Turn it on and check the time.

If the time is off by more than 1-2 minutes, the RTC is working incorrect. If the time has not changed, the chip is working properly, the problem is in the software part.

❓ Is it possible to manually register an NTP server without root access?

Yes, but the methods depend on the firmware:

  • On pure Android (Pixel, Motorola) - use the application ClockSync.
  • On Samsung —in the time settings there is a field for manually entering the server (hidden in the additional settings).
  • On Xiaomi/Redmi —requires unlocking the bootloader and editing file gps.conf.

Without root access, you will not be able to change system files, but you can use third-party applications to force synchronization.

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If your phone supports the Dual Clock feature (for example, on Samsung or Huawei), check whether both timers are lost. If only one goes wrong, the problem is in the settings of the second time zone.

If you have tried all the methods, but the Android clock still does not synchronize, we recommend contacting an authorized service center - especially if the phone is under warranty. In rare cases, the problem may be related to motherboard defect or a malfunction of the quartz resonator, which is responsible for keeping time. Don't delay diagnostics: the longer you use a phone with the time off, the higher the risk of data loss (for example, incorrect timestamps on photos or messages).