Windows 10 donot sync the time from BIOS clock

Da Du 6

Recently, we met an issue about the time sync on windows 10. For Example: The windows is running at 2021-02-17. Then, restart the computer, before loading the windows, entering the BIOS screen, then modify the time to 2020-02-17, save and restart again. After the windows startup, check the windows system time, it is 2021-02-17. If BIOS time modified to 2021-02-19, then the windows will change the time to 2021-02-19. It seems that the windows 10 donot sync the back time from BIOS. Based on the experience of Windows 7, the windows always get the time from BIOS on every restarting and then sync the time from network if a time server configed.
I want to know is it a design on Windows 10 or a wrong configuration of my windows 10 1809?

Da Du 6 Reputation points

2021-02-19T02:01:54.693+00:00

I tried the windows 10 1607 version, also has this issue.

1 answer

AliceYang-MSFT 2,081 Reputation points

2021-02-19T07:15:59.5+00:00

Hi,

First, let's check whether Windows Time service is running. If it is, we can restart it. Then, make sure Synchronize with a internet time server is checked.

Please follow steps listed to find them
Windows 10 - How do you stop the date from resetting automatically?

If the problem persists, we can try resetting BIOS settings. Steps may be different for different models. Here is an example for HP computers
How to Reset BIOS Settings on Windows PCs

Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.

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Da Du 6 Reputation points

2021-02-19T07:55:18.72+00:00

Hi, Alice
Thanks.
The key point is if the CMOS clock is ahead of windows time(2022-02-18), windows synchronize the time from the CMOS clock and if the CMOS clock is back of windows time (2020-02-18), it does not work.

More details:

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Do not configure an internet time server and I just need windows to synchronize the time from the CMOS clock every time when the computer is restarting.

Windows Time service does not run

Try on more than 3 kinds of computers and the issue exist.

AliceYang-MSFT 2,081 Reputation points

2021-02-22T10:22:30.467+00:00

Hi,

Sorry for my misunderstanding.

I tested in my computer. If I change BIOS time to 2022, it will stay in 2022 when I sign in. But if I restart it, the time will change back to 2021. And when I check Data/Time in BIOS, it's 2021 even I have done nothing which is really odd.

My OS is version 2004.

I will keep researching. Thank you for your time.

Da Du 6 Reputation points

2021-02-22T10:50:55.573+00:00

Hi, Alice
Thanks a lot.
Could you please do another test, change BIOS time to 2020, then restart the computer to check the windows time? And also make sure the windows do not configure the windows time service and it is better to leave off the internet.

AliceYang-MSFT 2,081 Reputation points

2021-02-23T09:25:49.99+00:00

Hi,

I got the same result this time.

I disabled my network adapters so there is no internet.

I tried to stop Windows Time service but found it running again after restart.

No internet time server is configured.

change time to 2020 in BIOS

Time is 2021 after sign in

change time to 2022 in BIOS

Time is 2022 after sign in

What's more

After time is 2022, I change it back to 2021 in BIOS. But it's still 2022 after sign in. After enable my network adapters, it's 2021. It seems that network connection is important in this scenario.

Hypothesis

With listed prerequisites, time will only be synced from BIOS when it's set to a future time for the first time. Or else, it won't sync from BIOS.

I will try this on another PC. Thank you for your patience.

AliceYang-MSFT 2,081 Reputation points

2021-02-25T06:26:11.2+00:00

Hi,

I tried on two other computers. One desktop and one laptop.

For desktop,
change time to 2020 in BIOS
It seems succeed after click Apply but a prompt said the operation fails
After sign in, system time is 2021

For laptop,
Change time to 2020 in BIOS
It seems succeed too and without the prompt
System time is 2021

It's quite confusing and sorry that I couldn't figure out why. I suggest contacting Microsoft Support for Business for help. Support engineers there have more resources and might know the reason.

Chan Nyein Naing 1 Reputation point

2022-11-04T03:55:58.493+00:00

Probably you might need to change your CMOS battery from M/B. Once power cut, the timing was set back to default. That's a sign of CMOS battery issue.

Da Du 6 Reputation points

2022-11-04T06:07:11.903+00:00

Thanks,but the battery is very well, I think it is not the key point.

Tomas_86 0 Reputation points

2023-02-16T12:21:13.3033333+00:00

I have the simillar problem

(https://learn.microsoft.com/en-us/answers/questions/1181336/how-to-detect-reset-of-rtc-time-in-windows-10)

How did you solved it ?

Thanks
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