Re: [gentoo-user] Re: Winter clock change did not happen

[Mick <michaelkintzios@gmail.com>]

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On Sunday 31 October 2010 17:03:32 Graham Murray wrote:
> Mick <michaelkintzios@gmail.com> writes:
> > MSWindows changed it to winter time when I eventually booted into it. 
> > Gentoo wouldn't show the winter time until I had first booted into
> > MSWindows.  If the setting CLOCK="local" is meant to make Gentoo use the
> > hardware clock like MSWindows does, why it did not behave the same as
> > MSWindows with the DST change?
> 
> Gentoo uses the "CLOCK=" value when it boots. It uses this to determine
> the initial system time. If you set to 'UTC' then the appropriate
> timezone offset will be applied. If it is set to 'LOCAL' then Gentoo
> assumes (and it has to) that the HWClock is set to the correct local
> time, including the correct Daylight Saving correction.
> 
> So, if Gentoo was running at the time of the clock change then the
> system time would have changed from Summer to Winter time. However, if
> Gentoo was not running and you booted it this morning then it would,
> legitimately, assume that HW Clock had been set to the correct local
> time prior to it be booted. When you booted into MSWindows, it changed
> the time on the HW Clock to be Winter time (ie it put it back 1 hour),
> so that next time you booted into Gentoo the HW clock was set to the
> correct local time. With CLOCK="LOCAL", when you boot for the first time
> after a Summer/Winter time change, Gentoo has no way to telling whether
> or not something else (eg MSWindows or manually via the BIOS setup) has
> already changed the HW clock to Summer/Winter time.

Thank you Graham for your very detailed reply!  I understand now why the 
problem exists.  I have used the registry change suggested by Nuno on Win7 and 
will see what gives next time DST changes.  I just hope that it'll work 
without having *both* OS shifting the clock by one hour ...

The more I read this page[1] the more I am tempted to format MSWindows out of 
this box whether the warranty is still valid or not!

[1] http://www.cl.cam.ac.uk/~mgk25/mswish/ut-rtc.html
-- 
Regards,
Mick

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