Date: Wed, 9 Jan 2008 13:44:10 +0100
From: Michal Schmidt <mschmidt@redhat.com>
To: Theodore Tso <tytso@MIT.EDU>
Cc: Martin Schwidefsky <schwidefsky@googlemail.com>,
       Tuomo Valkonen <tuomov@iki.fi>, linux-kernel@vger.kernel.org
Subject: Re: The ext3 way of journalling
Message-ID: <20080109134410.7380171b@brian.englab.brq.redhat.com>
In-Reply-To: <20080109122556.GL21097@mit.edu>
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	<20080108181525.GL27800@mit.edu>
	<6e0cfd1d0801090154r75c9ca93v5361aea45fe41bb5@mail.gmail.com>
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On Wed, 9 Jan 2008 07:25:56 -0500
Theodore Tso <tytso@MIT.EDU> wrote:

> On Wed, Jan 09, 2008 at 10:54:11AM +0100, Martin Schwidefsky wrote:
> > On Jan 8, 2008 7:15 PM, Theodore Tso <tytso@mit.edu> wrote:
> > > That will fix the this issue.  The problem you are facing is that
> > > you have your hardware clock set to ticking localtime, instead of
> > > GMT. Windows ticks localtime, which is a mistake carried over
> > > from the 1970's and MS-DOS.  Ticking localtime has all sorts of
> > > problems, among which is if you reboot around the transition
> > > between Summer Time (or Daylight Savings Time, depending on your
> > > contry) and normal time, the OS has no idea whether the DST
> > > adjustment has been applied or not.
> > 
> > Actually you can force Windows to accept a hardware clock in UTC:
> > HKEY_LOCAL_MACHINE/SYSTEMCurrentControlSetControl/TimeZoneInformation/RealTimeIsUniversal
> 
> Oh, so cool!!!  Do you know off hand what version of Windows started
> honoring that registry setting? 
> 
> And what do you set that registry value to?  Just a boolean "true"?
> 
> Now, how to convince Ubuntu to put this in their FAQ so I stop having
> their ahhh, less than clueful dual-booting Windows users who happen to
> live in Europe stop submitting bugs on this issue....

According to http://www.cl.cam.ac.uk/~mgk25/mswish/ut-rtc.html it's
been there since Windows NT, but it is more or less broken in all newer
versions.

Michal
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