Re: ntpdate, /etc/timezone et all.
On Sun, Mar 18, 2001 at 05:38:07PM -0500, Stan Brown wrote:
> On Sun Mar 18 16:11:55 2001 Carel Fellinger wrote...
...
> >I'm no time expert, just thinking that maybe al is swell afterall.
> >So could you post the outcome of the following commands?
> >
> > # date && hwclock --show
>
> Script started on Mon Mar 19 01:18:10 2001
> yogi:~# date
> Mon Mar 19 01:18:13 EST 2001
> yogi:~# hwclock --show
> Mon Mar 19 01:18:21 2001 -0.495009 seconds
> yogi:~# echo $TZ
>
> yogi:~# cat /etc/timezone
> US/Eastern
> yogi:~#
> Script done on Mon Mar 19 01:18:41 2001
I don't know what that Script is doing, but if it merely contains
the commands I proposed, all looks swell. But...
Ofcourse I don't know what the real time is over there:), but it is
close to what it is here now, so it probably isn't what it says it is.
...
> OK, I'm totaly confused. There are 3 things involved here, as I see it. The
> hardware clock, which should be set to UTC. The kernels view of time, which
> should be the same as the hardware clock modified by the value of
> /etc/timezone, and the "user" view of time which should be UTC modifiedby
> whatever they have set TZ to, or if they have not set it, modified by what's in
> /etc/timezone.
>
> Have I got that correct?
Yep. The hardware clock is used at boot time to give the Kernel's
soft-clock a reasonable start value. From there on it isn't used at
all by the kernel.
*date* shows the time taken from the kernel's soft-clock and displays
it in local time format as defined by /etc/timezone or env. var TZ.
*hwclock --show* shows the time taken from the hardware clock and
again shows it in local time format as defined by /etc/timezone or
env. var TZ.
> If so why does my machine think it's 1 oclock tomorow morning? It's really
> about 18:30 EST.
Because both your hardware and your doftware clocks are wrong:)
> Please explain what I'm looking at wrong here.
Nothing, it's just time to use *ntpdate -q ntp.some.server* to see how much
your clocks have drifted from the real time. Do something like:
date && /usr/sbin/ntpdate -q ntp.iae.nl ntp.chello.nl && date
And show the output.
[[ just guessing, but after using *ntpdate ntp.some.server* do you
save the then correct soft-clock time in the hardware clock with:
hwclock --systohc
If so, the only thing left is that the time is so far off that
ntpdate refuses to correct the time, w'll see.
]]
--
groetjes, carel
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