[Linux-aus] Dual-booting Win*/*nix with UTC BIOS Clock

Grahame Jordan gbj at theforce.com.au
Tue Nov 19 09:36:00 EST 2013

On 18/11/13 17:31, Kim Hawtin wrote:
> On 17/11/13 01:12, Peter Lawler wrote:
>> Just wondering if anyone has some super cute hacks laying around that
>> 'helps' with the situation as per SUBJECT.
>> Last time I looked, I recall MS had decided on insisting system clocks
>> be in local time. It certainly explains why Win* boots in one time zone,
>> the same as it logs in as, but then flips '($X*$Y) / ($moon phase^2)'
>> seconds after loading the desktop.
>> If it weren't for email timestamps being a mess I wouldn't really
>> bother. The machine is just used for tests of builds. But it annoys me
>> no end every single day and I try to put it out of my mind but nooooo....
> In the past I've run VMs of various systems, the simplest and most
> reliable if a little hacky way is to boot up, force a reset of the clock.
> Once the network is up, have an init script to run ntpdate for force the
> clock to be up to date with the network NTP server. Then cron it to run
> every half an hour. Dealt with the nasty drift we had in our VM
> environment and gets around ticking/tickless kernel dramas some years
> ago. So what if we magically gain five minutes every half an hour?
> I don't recommend running NTPd and cron'ing NTPDate together. One or
> t'other ;)
> Anyhow, I'm sure this can be scripted and scheduled on windwos too.
> Doco I've been referred to for NTP on windows, not actually used it myself;
>     http://www.satsignal.eu/ntp/setup.html
>     http://support.ntp.org/bin/view/Support/ConfiguringNTP
> regards,
> Kim

You can change /etc/default/rcS to not use UTC


On windows you can regedit
/HKLM/System/CurrentControlSet/Control/TimeZoneInformation, set its 
DWORD value to 1


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