I am running Win10 Home on an older PC, and in the last few days (after updating the software as I'd been away for a couple of weeks) the time zone keeps reverting to UTC +8:00 (Kuala Lumpur, Singapore) rather than UTC +7:00 (Bangkok, Hanoi, Jakarta).

 

I click on Settings, Time & Language, Date & Time, and verify that the time is set automatically.

The Set Time Zone automatically option is greyed out and set to Off.

The Time Zone is also greyed out but is set to UTC +7:00.

 

 

I have set the Region to Australia for local content and Regional Format to Recommended [English (Australia)] so I see dates and times in my preferred format (not US English or Thai).

 

But after the computer has gone to sleep and I activate it after a few hours, the time reverts to UTC +8:00.

 

I seem to be only able to reset it by clicking on Add Clocks for different time zones, and selecting the Date and Time tab and change the time zone there, then selecting Apply and OK, as it is greyed out in the Settings/Time Zone window, as above.

 

 

But... after hibernation the PC time zone reverts to UTC +8:00 again.

 

Can anyone please suggest a fix?

 

Motherboard battery is there to save any BIOS changes. Easy to change yourself.

The answer to your problem could could well be here.

 

https://windowsreport.com/windows-10-time-keeps-changing/

On 2/11/2024 at 3:17 PM, KannikaP said:

Motherboard battery is there to save any BIOS changes. Easy to change yourself.

 

I think you're right... the CMOS battery needs replacing. 

Just now, Encid said:

 

I think you're right... the CMOS battery needs replacing. 

Glad I could help.

Last time I changed mine I bought the new one from near the checkout at my local small Lotus. That might save you a trip to your local computer shop.

Are you knowingly or unknowingly using a VPN? It may be set up to find the best location, or to do it randomly.  McAfee comes with a built in VPN , so if you have that, check its settings.  Just a thought.  

8 minutes ago, lungbing said:

Last time I changed mine I bought the new one from near the checkout at my local small Lotus. That might save you a trip to your local computer shop.

7-11s are good places to buy batteries because the turnover rate is pretty high so chances of fresh stock are better.  Still check the stamped date though

10 hours ago, lungbing said:

Last time I changed mine I bought the new one from near the checkout at my local small Lotus. That might save you a trip to your local computer shop.

BigC as well. That's where I got my last one.

If it were a problem with the CMOS battery, I would expect that the PC would lose the time altogether, not just change time zones.  Are you getting any CMOS errors when you start the computer.  

If you have a multimeter, check the battery is reading at least 3.0V. If it is 3V or more it's probably ok.

5 hours ago, JaiMaai said:

If it were a problem with the CMOS battery, I would expect that the PC would lose the time altogether, not just change time zones.  Are you getting any CMOS errors when you start the computer.  

 

I never turn it off... it goes into hibernation after a few minutes of no activity.

I usually have a few torrents downloading stuff in the background and overnight.

When I do restart the computer I don't get any errors.

 

No, I don't have a multimeter.