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Thread: Clock drops 4 hours. Not the CMOS battery.

  1. #1

    Default Clock drops 4 hours. Not the CMOS battery.

    Often when I boot my desk top clock has lost exactly 4 hours. It doesn't happen all the time, but I am getting sick of going into ->Configure Desktop-> Date & Time and fixing it. Right away, you would think that the CMOS battery is weak, however the bios clock is always bang on and never looses time. If the CMOS battery was weak would not the bios clock be the first to go?

    I have a KDE4 desktop and no matter which time display widget I have on it I get the same behaviour.

  2. #2
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    Default Re: Clock drops 4 hours. Not the CMOS battery.

    Are you using NTP?
    Yast - Sys - Date/Time

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  3. #3

    Default Re: Clock drops 4 hours. Not the CMOS battery.

    Nope. I am not using NTP. It is set manually and the time zone is correct too. Just to be certain I checked Yast -> system -> Date & time.

    This behaviour is very sporadic. It happens about every fifth boot. I think it happens most when I update something ( anything ) the previous session, but that could be coincidence.

  4. #4
    natural_pilot NNTP User

    Default Re: Clock drops 4 hours. Not the CMOS battery.

    does the four hour problem come up only after you have dual booted to
    a different operating system?

    is your local time zone located four hours from the zero meridian?

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    Default Re: Clock drops 4 hours. Not the CMOS battery.

    @natural_pilot
    You may be on the right track

    @thedarpone

    Specify whether your machine is set to local time or UTC in Hardware Clock Set To. Most PCs that also have other operating systems installed (such as Microsoft Windows) use local time. Machines that have only Linux installed are usually set to Universal Time Coordinated (UTC). If the hardware clock is set to UTC, your system can switch from standard time to daylight saving time and back automatically.
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  6. #6

    Default Re: Clock drops 4 hours. Not the CMOS battery.

    OK. Now I have to suspect my CMOS battery. To answer some of the questions here I went into bios to see if there were any settings that could account for what was happening and found my bios clock 8 hours off the mark.

    For the record this is not a dual boot system and I am -5 hours from the zero meridian.

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    Default Re: Clock drops 4 hours. Not the CMOS battery.

    Quote Originally Posted by caf4926 View Post
    Universal Time Coordinated (UTC)
    Slightly off-track, but UTC is not an acronym for anything, unless you backronym it by inserting a comma after Time. The English term is Coordinated Universal Time, and the French term Temps Universel Coordonn. UTC is a compromise to make both the anglophones and francophones equally unhappy.

    Coordinated Universal Time - Wikipedia, the free encyclopedia

    In any case GMT as a term should no longer be used.

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    Default Re: Clock drops 4 hours. Not the CMOS battery.

    In any case GMT as a term should no longer be used.
    Tell that to the Boffins at Greenwich.
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    Default Re: Clock drops 4 hours. Not the CMOS battery.

    Quote Originally Posted by caf4926 View Post
    Tell that to the Boffins at Greenwich.
    Here's another fact you may not know. Since it became possible to measure time very accurately, the true prime meridian is not where it's marked on the ground at Greenwich. Visitors hopping back and forth imagine that they are crossing the meridian, but the true meridian by atomic clocks is actually a few metres away. As a corollary, most maps of Britain are off by that much in terms of true longitudinal coordinates.

    On the other side of the Channel, the French, until UTC, refused to call it GMT. They called it Paris time, diminished by X minutes and Y seconds or something like that.

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    Default Re: Clock drops 4 hours. Not the CMOS battery.

    You are throwing temptation my way starting a French/English comparison.

    I'll not be upsetting anyone this time.

    I was actually not aware of the slight difference. I take it the time is actually the same even though there is a few feet between the two places?
    You might be interested in the work of John Harrison another great Englishman (Yorkshire Man at that!) NOT French
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