Windows time is always wrong
Jul 02, 2025 am 10:56 AMWindows time inaccurate is mainly caused by abnormal network time synchronization or aging of CMOS batteries. Solutions include: 1. Check the "Internet Time" setting to ensure that synchronization is enabled and use time.windows.com or ntp.aliyun.com; 2. Modify the registry key RealTimeIsUniversal to 0 to correctly identify the BIOS time; 3. Replace the motherboard CMOS battery to avoid resetting time after power outage; 4. Turn off "Auto-adjust daylight saving time" or confirm that the time zone settings are accurate. The troubleshooting order is recommended to set the software first and then the hardware problem.
Windows time is always inaccurate? This is actually a common problem, especially a computer that has been used for a long time or a machine that has just been installed in the system. System time errors may affect the normal operation of logging, timing tasks and even some software. Let me just talk about the key point: the time is not accurate, most of the reason why the network time synchronization is not done well, or the CMOS battery is almost out of power .

Network time synchronization settings are incorrect
Windows will try to calibrate time through the Internet by default, but if this function is turned off or the server cannot be connected, time will easily go off. You can check this way:

- Open Control Panel → Date and Time → Internet Time
- Check if "Sync with Internet Time Server" is checked
- It is recommended to change the server to
time.windows.com
orntp.aliyun.com
available in China
If "The server cannot be contacted" is displayed, you can try changing the network environment, or temporarily shutting down the firewall and trying again.
There is a problem with BIOS time and time zone settings
Sometimes you will find that the time is several hours short of each restart, which is most likely because Windows and BIOS are not synchronized. It is generally recommended that Windows manage time by itself instead of relying on the motherboard.

The solution is as follows:
- Press
Win R
to enterregedit
to open the registry editor - Positioning to
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation
- Find
RealTimeIsUniversal
item. If not, you can create a new DWORD (32-bit) and set the value to 0
After doing this, Windows can correctly recognize the BIOS time, avoiding time disorders after restart.
CMOS battery is insufficient
If your computer is often powered off and the time is reset, such as the power-on time goes back a few years ago, it may be that the CMOS battery on the motherboard is about to run out of power. This situation is particularly common in old machines.
The solution is very simple:
- Shut down and unplug the power cord
- Open the chassis to find the round button battery on the motherboard (usually CR2032)
- Take it to the electronic market or buy it online for a replacement, the cost is about a few dollars
After changing, remember to enter the BIOS to reset the time and date.
Automatically adjusting daylight saving time is inaccurate
Some areas will enable automatic daylight saving time adjustment, but if your system area or language pack is not set correctly, it may cause an extra or less hour of time to be added.
Inspection method:
- Right-click on taskbar time → “Adjust date/time”
- Check if the "time zone" is correct, for example, China is "China Standard Time"
- If you do not need the daylight saving time, you can turn off the "Auto-adjust the daylight saving time"
Basically these are the reasons. When encountering the problem of inaccurate time, check the network synchronization and BIOS settings first, and then check if the hardware is aging. These problems are not complicated, but they are easy to ignore details, especially in places like time zones and registry settings. If you correct the problem, it will make the problem more troublesome.
The above is the detailed content of Windows time is always wrong. For more information, please follow other related articles on the PHP Chinese website!

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