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Re: Time quandry when dual boot with WinXP Pro

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On Sat, 22 Oct 2016 09:57:05 -0500
David Wright <deblis@lionunicorn.co.uk> wrote:

> On Fri 21 Oct 2016 at 18:47:43 (+0100), Joe wrote:
> > On Fri, 21 Oct 2016 09:58:42 -0500
> > David Wright <deblis@lionunicorn.co.uk> wrote:  
> > > 
> > > . Neither OS was running when Civil Time changed to/from DST,
> > > . After the time changed, one OS has run, updating the Local Time
> > > to match Civil Time, . Another OS is just being booted up.
> > > 
> > > What Local Time will eventually be displayed by this system?
> > >   
> > DST may well be the answer.  
> 
> (I can't see how that answers anything, as I hadn't specified which
> way time changed, nor can I see why it would be an answer in either
> case.)
> 
> My concern is that the second OS to boot might apply the time change
> in exactly the same manner as the first one did and should have done.
> So the system's Local Time would end up an hour fast (were this late
> Spring) or slow (were this late Fall) after the second OS applied its
> own time change.
> 
> Or IOW what mechanism is there for one OS to find out whether another
> OS has altered the RTC by an hour any time recently?¹
> 
> > If I boot Linux on my Win8 laptop in the
> > summer, it knows the time perfectly well. If I now boot Win8, the
> > clock is an hour ahead. It does use a network time source but it
> > does not query the source on boot, or soon afterwards. Eventually
> > it will do so, but on a fixed schedule, so not for days, and there
> > seems to be no way to fix it. It's not just the first time after
> > DST arrives, it's every time.  
> 
> But isn't that just a configuration problem which I assume is unusual
> in that most people are not reporting that problem? What's more, you
> don't say whether your RTC is running UTC or some other time.
> 
> Ignoring drift, a RTC running UTC never changes, so the hardware
> always knows the correct time. The Local Time displayed is just a
> matter of sensible configuration.
> 
> My question, posed above, is *only* of concern where the RTC is
> running non-UTC, ie it gets fiddled with twice a year. At these two
> times, the RTC could be subject to incorrect alterations by
> erroneously configured OSes, or even multiple OSes perfectly
> configured, but unaware of each other's actions.
> 
> > I give it a kick manually, which of course involves entering an
> > admin password...  
> 
> which is the necessity we're trying to avoid.
> 
> ¹ There's another similar concern should you have more than one OS
> thinking it's responsible for measuring and taking account of clock
> drift. Whether this is going to concern people who are rebooting OSes
> all the time is moot.
> 
> Cheers,
> David.
> 

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Time quandry when dual boot with WinXP Pro Richard Owlett <rowlett@cloud85.net> - 2016-10-21 15:20 +0200
  Re: Time quandry when dual boot with WinXP Pro Darac Marjal <mailinglist@darac.org.uk> - 2016-10-21 15:30 +0200
    Re: Time quandry when dual boot with WinXP Pro Richard Owlett <rowlett@cloud85.net> - 2016-10-21 16:50 +0200
    Re: Time quandry when dual boot with WinXP Pro David Wright <deblis@lionunicorn.co.uk> - 2016-10-21 17:10 +0200
      Re: Time quandry when dual boot with WinXP Pro Joe <joe@jretrading.com> - 2016-10-21 19:50 +0200
        Re: Time quandry when dual boot with WinXP Pro David Wright <deblis@lionunicorn.co.uk> - 2016-10-22 17:10 +0200
          Re: Time quandry when dual boot with WinXP Pro Joe <joe@jretrading.com> - 2016-10-22 17:10 +0200
          Re: Time quandry when dual boot with WinXP Pro Joe <joe@jretrading.com> - 2016-10-22 17:50 +0200
            Re: Time quandry when dual boot with WinXP Pro David Wright <deblis@lionunicorn.co.uk> - 2016-10-23 04:50 +0200
  Re: Time quandry when dual boot with WinXP Pro <tomas@tuxteam.de> - 2016-10-21 15:40 +0200
    Re: Time quandry when dual boot with WinXP Pro Richard Owlett <rowlett@cloud85.net> - 2016-10-21 16:30 +0200
      Re: Time quandry when dual boot with WinXP Pro Doug <dmcgarrett@optonline.net> - 2016-10-21 18:50 +0200
        Re: Time quandry when dual boot with WinXP Pro Richard Owlett <rowlett@cloud85.net> - 2016-10-21 20:20 +0200
          Re: Time quandry when dual boot with WinXP Pro <tomas@tuxteam.de> - 2016-10-21 21:20 +0200
      Re: Time quandry when dual boot with WinXP Pro <tomas@tuxteam.de> - 2016-10-21 21:20 +0200
        Re: Time quandry when dual boot with WinXP Pro tomas@tuxteam.de - 2016-10-21 21:30 +0200
          Re: Time quandry when dual boot with WinXP Pro Richard Owlett <rowlett@cloud85.net> - 2016-10-21 22:20 +0200
            Re: Time quandry when dual boot with WinXP Pro <tomas@tuxteam.de> - 2016-10-21 22:40 +0200
  Re: Time quandry when dual boot with WinXP Pro Stefan Monnier <monnier@iro.umontreal.ca> - 2016-10-22 22:10 +0200
    Re: Time quandry when dual boot with WinXP Pro Richard Owlett <rowlett@cloud85.net> - 2016-10-22 22:20 +0200
      Re: Time quandry when dual boot with WinXP Pro Stefan Monnier <monnier@iro.umontreal.ca> - 2016-10-22 22:20 +0200
        [REPOST] Re: Time quandry when dual boot with WinXP Pro Richard Owlett <rowlett@cloud85.net> - 2016-10-25 14:20 +0200
        Side effects of specifying use of NTP on installation???? - was [Re:  Time quandry when dual boot with WinXP Pro] Richard Owlett <rowlett@cloud85.net> - 2016-10-25 14:20 +0200
  Re: Time quandry when dual boot with WinXP Pro Lisi Reisz <lisi.reisz@gmail.com> - 2016-10-29 16:50 +0200
    Re: Time quandry when dual boot with WinXP Pro Felix Miata <mrmazda@earthlink.net> - 2016-10-29 17:30 +0200
      Re: Time quandry when dual boot with WinXP Pro Lisi Reisz <lisi.reisz@gmail.com> - 2016-10-29 18:20 +0200

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