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Thread: PC Clock goes back a day
14-10-2012, 09:34 PM #1
PC Clock goes back a day
The clock on my PC (yep, bottom right-hand corner) has very recently started to show the incorrect date and time. For example, earlier today when I booted it up, the clock showed something like 13/10/2012, 21:54, when actually it was 14/10/2012, 11:01 (roughly, you get the idea).
Could it be a flat CMOS battery as my PC is now 4 years old? Or is there something in the BIOS I could or should check? Also, if you change the CMOS battery, do you lose the BIOS settings?
Any help gratefully accepted.
14-10-2012, 09:53 PM #2
It probably is the battery. Do you ever turn your PC's mains connection off?
15-10-2012, 01:49 PM #3
- Join Date
- Jun 2011
Have to say my first hunch would not necessarily be the cmos battery, as typically when that goes the date will get reset to Unix time (1st Jan 1970) or some similar waaay out date. Going back just a day doesn't sound particularly like a battery symptom - I'd be more inclined to think, at first guess, that your OS is picking up time from an icky time server.
How you check that is going to depend on OS, Win 7 (and I *think* Vista), click on the clock, click "change date & time settings" and then go to the "internet time" tab. For internet time servers, "time.windows.com" is a safe enough choice or most universities run one, your ISP probably runs one too. Or for old schoolers, the DOS command "net time" provides a wealth of options.
15-10-2012, 09:14 PM #4
15-10-2012, 09:39 PM #5
- Join Date
- Jun 2011
Is your timezone set correctly? If your computer thinks you're GMT-11, that might be doing it."Swans are so big, they're like the Ostriches of the bird world"
16-10-2012, 09:48 PM #6
Bought a new CMOS battery today, and going try that - I assume I won't lose my BIOS settings??? Will check my timezone first, but seems strange as only in the last week has it started it doing it, and I've not changed any setting myself.
16-10-2012, 09:58 PM #7
Turning it off at the mains will cause this, eventually. If you leave it plugged in it will receive enough power to keep the time. If it's not receiving power from the mains it's draining the battery, and it won't be keeping time correctly overnight. So you're turning it on the next morning and it's still showing the time from the previous night.
If you replace the battery while the system is on at the mains (with the PC off, of course), you won't lose the settings. Obviously you wouldn't normally want to work on a computer with the mains on, but you will lose your settings otherwise.
16-10-2012, 10:03 PM #8
18-10-2012, 09:10 PM #9
For NTP servers, I prefer the bunch hosted by the NTP pool project. You can set it by region, so if you're in the UK, connect to uk.pool.ntp.org
And yes, you should replace the battery. Even if you have to remove your graphics card it should be a 5 minute job tops and it can save you a lot of troubles later on.
20-10-2012, 02:54 PM #10
Finally fitted a new CMOS battery yay! Left it too late though, and had already lost my settings. Have got them back to how they should be though I think. Will know next time that it starts with the clock going a bit awry. Thanks for all the advice.
05-11-2012, 02:33 PM #11
- Join Date
- Nov 2012
did you sort that issue?
05-11-2012, 07:15 PM #12