Re: how to change date of system
On Wed, Nov 12, 2008 at 6:44 PM, John Hasler <jhasler@debian.org> wrote:
> Nye writes:
>> How do you prevent both Linux and Windows from attempting to correct the
>> time for DST, and ending up an hour out?
>
> Linux doesn't do that.
>
That's a bold statement. Could you clarify, as it sounds like you are saying
that local time displayed in Linux is an hour out for half the year parts of
the world that observe DST (at least for those who set their HW clock to
local time), and I'm sure that's *not* what you mean. Possobly you just mean
that people sing local time should expect to change their clock manually for
DST? That's not my experience anyway, unless I've explicitly told it not to
make the adjustment, but it may have been done by some part of KDE or
whatever I was using at the time.
>> Do you just tell one of them not to change the clock, and live with it
>> being wrong until you boot into the other one?
>
> No. Since Windows is incapable of dealing with UTC you put the BIOS clock
> on local time and tell Linux that you have done so. Linux then assumes
> that the BIOS clock gives correct local time and that someone else is
> taking care of DST. This works as long as you boot Windows frequently
> enough.
Although you say 'no', the elaboration sounds a lot like 'yes'. I can see no
way that Linux could possibly know whether Windows has yet changed the clock
or not (to know whether it needs to apply an offset to get the correct local
time), and hence must assume that it has. This means that the time will be
wrong until you boot into Windows, which is what I said. If I have
misunderstood you, then I would appreciate being corrected.
-Nye
PS. Technically Windows is capable of understanding that the HW clock is set
to UTC as god intended (Google RealTimeIsUniversal), and this appears to work
just fine ... until some things start to act a bit *wierd*.
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