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I have a batch of HP Prodesk 400 G2 computers with UEFI and Windows 10. From time to time, every day, the time and date reset to a fixed one, 2-3 weeks ago. I checked and reset the time from the UEFI. Windows 10 read this time and works ok. After some time the clock resets again to a previous date, 2-3 weeks ago, the same date. Because I use the same Windows 10 image disc for all the PCs many of them works fine but 3-4 of them don't. So what can cause this type of malfunctioning? I'm not sure the battery is the problem since that's nothing to indicate that. The computer is 1 year old. Could a malfunction of the battery cause the problem ? Thank you!

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  • Yeah, I would start by replacing the CMOS battery. They are cheap and its the first thing I would try.
    – Bitten Fleax
    Commented Jul 14, 2016 at 8:24
  • Wait, are you sure you're not 2-3 weeks in the future every time you set the clock and the computer is just resetting to the correct date? :) seriously, if it's happening on multiple computers it cannot be a bios issue it sounds like some software is messing with your dates, perhaps synching to some inaccurate time source.
    – user576053
    Commented Jul 14, 2016 at 12:11
  • If the laptops are from the same batch and have been left for a period of time without being used/charged then it is plausible that the CMOS batteries have depleted in a similar time... it does very much sound like a CMOS battery problem.
    – Kinnectus
    Commented Jul 18, 2016 at 13:53

2 Answers 2

Reset to default
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For the moment it works with these:

w32tm /config /syncfromflags:domhier /update

net stop w32time

w32tm /unregister

w32tm /register

net start w32time

w32tm /resync

The time may be out of sync with the domain controller even if it seems the computer is working properly in the domain.

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Do you have a Comodo Time Machine a Deep Freezer or any software who maybe made a snapshot of your pc around that time?

The date is stuck around 3 weeks ago, is very unlikely to be a battery malfunction, but always it's worth a try

If nothing is working you always can make a .bat file and set it to start on the start up of the PC.

https://msdn.microsoft.com/en-us/library/windows/desktop/aa376977(v=vs.85).aspx

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  • I don't have those type of freezing software. Each computer locks to its activation date.
    – kpk1
    Commented Jul 19, 2016 at 8:36

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