Why is my BIOS time wrong?

The clock is showing the wrong time

This basically deals with the problem when your PC is showing the incorrect time in Windows even after you may have adjusted it various times in settings. The correct time is important for such things as updates (which can be blocked) and various software which will not run with the incorrect time. Naturally, it is also always useful to just know what time it is

So, that is what you must first check. Is the time set correctly in Windows Settings (right-click on the clock in the lower corner of the desktop and click on change date/time).

-check date and time

-check you have the correct time zone for your country

-you can also leave automatic time synch switched on which will check with a server and synch the correct time to the PC. (after a while)

can also check if the correct time is set in BIOS.

-Turn off PC by holding the power button

-Turn on PC and continuously press ESC until startup menu appears

-Press F10 to enter BIOS

-Set the correct date and time and exit BIOS saving changes

Now let’s quickly take a look at a few scenarios:

New PC wrong time after every reboot:

You have a brand new PC which is showing the wrong time after every reboot. Maybe a few hours off. Newer model
notebooks have no CMOS battery (RTC battery) so it is not going to be the failure. I have come across this situation a few times recently and the solution was to update the BIOS of the machine. (It is a good idea to completely update a new PC in Windows settings and HP support assistant with all the necessary reboots in any event)

So to update BIOS you can open HP support assistant which you can find in Start Menu or by clicking on the blue circle icon with the question mark in it in the
Task Bar

Here click on updates and see if there is a BIOS or Firmware update available and install. Update everything else while you are at it.

You can also insert your model or product number (how to find it) into product search page (here) and go to the drivers and software section. You
should be able to find the latest BIOS available in the list. Download and install.

Dual Boot Linux and Windows

You have created a dual boot situation on your PC with Windows and Linux and the time is not correct in Linux or in Windows.

Linux uses UTC time and Windows local time.

In this situation, you either need to make Linux use local time or Windows use UTC time so that they will both show the correct time

In Linux:

timedatectl set-local-rtc 1 –adjust-system-clock

to undo:

timedatectl set-local-rtc 0 –adjust-system-clock

In Windows:

Open the registry editor and go to:


In Windows 64-bit create a QWORD and in Windows 32-bit create a DWORD


Double-click on the new entry and
set the value to 1

Wrong time and date at every reboot (CMOS / RTC battery)

The CMOS battery should last for about 5 years or more, so if it is a new PC this most likely is not the problem.

If the time and date are wrong at every reboot (maybe even, always the same incorrect date and time) it could be that you need to replace the CMOS battery (RTC battery). Usually, there will be other problems, such as errors at boot, the might stop at boot
and ask you to adjust settings and time (every reboot once not connected to external power) and all BIOS settings will fall back to default each time with various problems that can arise from this.


To replace the CMOS battery in desktop is usually quite easy, you will see the coin battery on the motherboard (CR 2032 battery) which you can remove and replace with a new battery for a couple of $ or less. To open the case of the desktop you can go to the
product page of your model and under the heading Manuals, you will find manuals on how to open the case to replace hard drive or RAM.

Look for the CMOS battery on the motherboard and replace it.


Many notebooks also use the same battery or can have different shapes of the battery. Modern notebooks where the main battery is non-removable may not have an RTC battery.

in notebooks it is more difficult to replace the battery. Sometimes it is accessible under the service door, but many times you will need to remove the bottom or top cover of the notebook to get access to the battery on the motherboard. You can usually find the service manual for the notebook on the product page for your model under the heading Manuals, In the manual search for RTC battery and there will be the steps on how to replace it.

Forcing the correct time

wrote this article after reading the suggestion by @anthony82 in this thread


Basically, this avoids the underlying
problem of what is causing the wrong time by creating a Task in Windows at boot where the PC will connect to a time server and adjust the time/date at every reboot. This will work in most cases but is avoiding the problem and if you have a bad CMOS battery, the time/date will not be the only problem.

It will only work if the PC is connected online at startup.

I hope it helps and please reply if this does not solve your issue.

You can always send me a message.

We would like to encourage you to post a new topic in the community so our member will be able to help you as well, here is the link to post.


How do I fix my BIOS time?

Setting the date and time in BIOS or CMOS setup.

In the system setup menu, locate the date and time..

Using the arrow keys, navigate to the date or time, adjust them to your liking, and then select Save and Exit..

How do I fix CMOS date and time not set?

Another way to fix CMOS Checksum Bad – Date Time Not Set error is to reset the CMOS settings. You can do this by removing the CMOS battery for a few minutes and then replacing it. This will cause the CMOS settings to be reset to their default values.

What time should BIOS be set to?

In most cases, I would recommend to set BIOS to UTC time.

Why is my PC showing the wrong time?

Navigate to Control Panel > Clock, Language and Region > Date and time > Set the time and date > Internet time > Change settings > check Synchronize with an Internet time server and click Update now.

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