OS changes the BIOS date and time? Since when?

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dnyberg2

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Feb 22, 2012
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I found out that installing a windows OS on a PC changed the BIOS clock setting even though I DONT want it to do that! Anyone know any way to STOP that from happening? MB is ASRock Rack EP2C602-4L/D16 Dual LGA2011 with two Intel Xeon E5-2670 SR0KX's on it. This happened with Win 10 Enterprise and Win 10 Pro.
 
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UPDATE: By the way, the date the OS changed the BIOS to seems related to its publish date. I get one date and time for Win 10 Enterprise and a completely different one for 10 pro! Has it always been this way?
 
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From the time and date settings disable the auto update from the internet option, then set the time how you want it and it should stay that way.
Yes windows time and date settings have changed the system clock in the BIOS for a very long time now, I'm pretty sure at least as far back and windows 95.
At least for the time this is normal, I haven't seen the date automatically change before.
 
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I think so, some manufacturers offer software tools that run under windows and allow access to some BIOS options and it's possible with a utility to reboot directly into the UEFI but generally speaking letting the OS access the BIOS/UEFI is a bad Idea.
 
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The problem with changing the Windows and BIOS time/date from "Today" is that other things may fail to work.

What software is doing this? Is it a date based trial, perhaps?
 
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I have a very old software package that has technical issues running in "real time". It needs to think the date is from when it was launched around 2016. i cant go into more specifics. Its not a trial. Is there any way to STOP windows from updating the BIOS clock on install?
 
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Crippling your whole OS to run a single application of which there is almost certainly an update from the manufacturer, or an alternate application that actually runs properly?

The correct 'time' is part of the HTTPS handshake and certificate validation.
 
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Sorry but no thats not the right track. Its a custom thing. Its part of an experiment that does not involve the net or any connection to the current correct time. The experiment involves time. I cant a allow the OS to touch the BIOS. Is there any way to stop this?
 
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I already mentioned it - from windows time and date settings unselect the auto update option. I'd test it myself but I don't have rights on this machine but I'm fairly certain it's as simple as that. I am sure I remember web sites refusing to load and updates refusing to download because my PC though it was the wrong month for a few days at one point.

Also you could just not connect to the internet then it has no way to know the time is wrong.
 
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OK, then...that's a whole different thing.
A backstory like this is needed upfront.

Install the OS, change the BIOS date back to when you need it, and proceed on.
An OS that never goes online should not change anything after that, because it has nothing to check in to.
 
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Still not what I put out front. Unplugged the internet. Set the BIOS to 2000. Installed the OS and the OS install set the clock to some time and date in 2018!!!
Doesnt matter the OS ver. Try it!
 
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I forgot to mention that there is some sort of trace that happens somewhere in WIN OS if the BIOS time and or date gets set by the OS. No idea where that happens but its very annoying for my needs. I'm trying an older version of 7 pro to see where it sets the BIOS up to. If that date is out of range for my SW, then I will be a winner!
 
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