The CMOS clock on my Linux systems seem to lose time gradually and my
favorite way to try to keep the time in sync is to perform regular time
adjustments. I have a program I picked up several years ago called
"nistime" that obtains a time string from the National Institute of
Standard's atomic clock. I then have been having my systems do a
"/sbin/clock -w" once a day when the daily cron job kicks off at 06:53
hours. This has helped keep my CMOS clocks much closer to actual time.
Jim Osborn wrote:
>
> Brad Shelton <[EMAIL PROTECTED]> responds:
> >After you set the time, you need to write it to the hardware clock.
> >Othwise it'll continue to get the wrong time from the hardware clock.
> >
> >To set the hardware clock, as root do clock -w.
>
> Thanks, Brad, and others. I guess it goes to show how long
> it's been since I've upgraded; my ancient Slackware setup
> wrote to the hardware clock whenever I did a simple `date.'
> I'd never heard of the `clock' or `hwclock' commands.
>
> Another question occurs, though. In my previous setup, changes
> to/from Daylight Savings Time were automatic. I assume knowledge
> of these changes is in the Linux software, not the hardware
> clock, but in any case, I never had to perform any administrative
> tasks at that time of year. In fact, I could check with Linux
> if I was in doubt if this was the time of changeover.
>
> Since I bought this machine just before last fall's change from
> DST, and I rarely reboot, I suspect SuSE 5.3 does NOT update the
> hardware clock after the DST change, but the normal Linux date
> routines know when the change occurs and adjust the soft clock,
> and that's why I didn't know anything was amiss.
>
> What do you all recommend now to cope with DST? Should a routine
> be added somewhere to write to the hardware clock when a change
> to/from DST occurs, say, as a twice-a-year cron task? If so,
> does anyone have a favorite cron spec for USA DST?
>
> I'm suspicious that my hardware clock is likely not very accurate,
> given that it seemed to be off noticably in the short time I halted
> my machine in my testing. What do you folks recommend as a source
> of accurate time? Is your computer crystal clock pretty good?
> Do you periodically dial up a standards bureau? Favorite suggestions?
> Given all the capabilities of clock(8) and hwclock it's tempting
> to go for some accuracy. My current /etc/adjtime is all zeros.
>
> Thanks again,
>
> Jim
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