Computer Help forum


Why is my computer date and time keeps changing?

by pokeredfaced / August 31, 2011 8:04 PM PDT

I just bought a new Toshiba Satellite R840-12C when I was in UAE two weeks ago and my problem is that date and time keeps changing. Example: let's say that the date today is 9/1/2011 and the time is 5:43 PM. Once I rebooted my system, the date and time becomes 8/31/2011 & 5:43 AM. Some people told me that the problem is CMOS battery but it couldn't be since it is new. I cannot contact the store because right now I'm here in Singapore.

Windows 7 Home Premium 64-bit
AMD Radeon HD 6450M
Intel Core-i5 2nd generation (2.30 GHz)

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Clarification Request
time and date is changing?
by hawkinsmyra / October 13, 2011 8:31 AM PDT

My computer clock and date is changing and will not keep the correct time. My Computer was purchased in Feb. 2011 and have never had this happen with a laptop before.

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(NT) First idea. Check your TIME ZONE settings.
by R. Proffitt Forum moderator / October 13, 2011 8:43 AM PDT
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Clarification Request
I have .. same computer ..same problem
by trish060 / September 21, 2015 12:29 PM PDT

and can't find anywhere to post *however* mine is caused by a hacker that thought it "funny" to add a program he found at a website I won't mention here.

It's horrible that each time you log off the computer you then need to change the date and time !

I haven't read all the posts here (only 10) but I can assure you :
1) it's not the battery
2) that if they didn't live next door to me I never would have known someone could come into your home and add a program they had put to disk and leave in the time it took to walk a dog outside !

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(NT) Since you know what it is. How about the cure?
by R. Proffitt Forum moderator / September 21, 2015 1:02 PM PDT

All Answers

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by Jimmy Greystone / August 31, 2011 10:52 PM PDT

Well, the CMOS battery is a good guess, and I'll just say that I've had a system brand new from the factory, and within a week the CMOS battery was dead. How new the computer is doesn't matter. The battery could have been sitting in inventory somewhere for years, or it could just be one of those defective ones that slip through the cracks of statistic sampling for quality assurance.

Still, I think the problem is more that your time zone is still set for UAE and hasn't been updated to reflect being in Singapore now, so every so often Windows will check in with some time server on the Internet, get the proper time for the time zone you have set, and make sure the two match.

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Re: timezone
by Kees_B Forum moderator / August 31, 2011 10:59 PM PDT
In reply to: Well

I had been thinking about that. But in the example given by the OP, the difference is exactly 1 day (24 hours). I didn't check, but I guess the timezone difference between UAE and Singapore is 4 or 5 hours. So that doesn't fit.
But maybe the OP gave a wrong example.


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Me too.
by R. Proffitt Forum moderator / August 31, 2011 11:29 PM PDT

I traveled far and Windows synced the time to the local timezone. You want want to disable that if this is unacceptable.

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re : Why is my computer date and time keeps changing?
by FilthElement / October 13, 2011 2:14 PM PDT

Try disabling the automatic internet synchronisation in windows and disable the automatic daylight savings adjustment, but leave the incorrect time alone.
then shut down and restart the computer and change the time and date in BIOS.
After windows starts check to see if the time and date has changed, if not switch the computer off for a few hrs and restart and check the bios settings to see if it has changed, if so, your CMOS battery is probably dead.

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Time and Date Changing
by tarnall / March 24, 2013 3:36 PM PDT

My computer just started to changing the time and date, but I don't travel. I changed the 3v CMOS battery and it still does the same thing. I have had this computer for over 5 years, I didn't think about the computer deciding on it's own to search the internet for some correct time. I have another HDD in the machine running Linux/Ubuntu. I will use the OS for a while to see if the time still changes or not. Terry, Hayward, CA, USA

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CMOS batteries and BIOS
by mjd420nova / March 25, 2013 11:10 AM PDT

Not only does the CMOS battery keep the clock running but holds your systems BIOS settings when powered down. The date the unit keeps coming up with is the date of the BIOS, it appears because it had to default. CMOS batteries are the cause of the strangest and difficult problems to diagnose because they don't usually appears as apparently. The battery may be a button cell or even hidden capacitors under a chip socket. Some of older Toshibas had a two part CMOS cell arrangement and was quite difficult to replace. Take it back.

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Date and Time Changing.
by tarnall / March 25, 2013 2:24 PM PDT

Welp, I have three HDD in this computer, one running my orginal Win7, one running Ubuntu and another one I just installed with a fresh copy of Win7. Times and dates still changing. I have already put a new button cell in the first time I noticed the problem. So I took one of the suggestion I read about on this blog...I turned off the Automatic Internet time set, one at a time for all three HDD/OSs. So far to good. I'll know more tomorrow when I wake up the computer again.

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by WebOutGateway / September 21, 2015 7:36 PM PDT


If the time and date are resetting each time your computer is powered down,
the CMOS battery is bad and needs to be replaced.

Have a nice day!

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