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Date: Tue, 20 Aug 2002 15:31:17 +0100
From: Liam Bedford <lbedford@lbedford.org>
To: Anthony <ant@elivefree.net>
Cc: ilug@linux.ie
Subject: Re: [ILUG] hwclock
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On Tue, Aug 20, 2002 at 03:07:35PM +0100, Anthony wrote:
> > > In my experience Windows will change the hardware clock the first time
> > > you boot into it after the clocks have gone forward/back an hour.  This
> > > will only happen twice a year. How to stop it, I have not checked (I
> > > just switch the clock back an hour from within windows after such a
> > > reboot).  Is there a GMT windows timezone?
> > 
> 
> > Start->Settings->Control Panel->Date/Time->Time Zone tab-> Uncheck
> > "Automatically adjust clock for daylight saving change".
> > 
> 
> Ah, that's grand. I knew about that aspect and had already unchecked the
> appropriate box. I was just worried that Windows was engaging in
> undocumented behaviour that I didn't know about.
> 
well, it changes the time then, and then leaves it alone.

However, Windows expects the time in the RTC to be local time. Linux
can be configured to do either this, or to have the RTC at UTC,
and then use /etc/localtime to figure out the right timezone.

Depending on how you've set it up, this may be a problem (with one
or other of the OS's one hour out). OS-X also does this silliness :(

(RTC should always have UTC, that way different people can set their
own timezone on the machine... though I suppose that only applies
to multi-user machines).

L.

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