On 11/29/06, Owen Heisler <[EMAIL PROTECTED]> wrote:
With the regular GUIs in Windows (XP), I don't think it is possible to
use BIOS UTC time... but maybe (probably) there is some very well
hidden, badly named registry key that magically makes Windows read UTC
time from the BIOS. If someone knows what it is, I'd be interested.
Well, I clicked "send" but then decided I may as well look around to
see what I can find on the net via Google. It seems that there exists
an undocumented registry key that tells Windows that the BIOS time is
UTC.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation\RealTimeIsUniversal
(REG_DWORD = 1)
It seems Windows might do weird things with this setting, like assume
still that the time is not UTC and then update for DST or NTP... but
perhaps that can be circumvented by disabling both. There is mention
of some other bugs too. Oh, and it seems that Windows Vista will not
support BIOS UTC time either (or doesn't, I don't know or really even
care if it has been released or not). Here are the links I found (the
second is Google's cache; the real page wouldn't work for me):
http://www.cl.cam.ac.uk/~mgk25/mswish/ut-rtc.html
http://216.239.51.104/search?q=cache:1pIggEd-0YUJ:dlgwiki.dot42.org/index.php/Allow_the_system_clock_to_be_set_in_UTC/GMT+http://dlgwiki.dot42.org/index.php/Allow_the_system_clock_to_be_set_in_UTC/GMT&hl=en&gl=us&ct=clnk&cd=1&client=firefox
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