NTP and POSIX Time in conflict?

Markus Kuhn Markus.Kuhn at cl.cam.ac.uk
Sat Dec 9 14:40:24 UTC 2000

"Alan Perry" wrote on 2000-12-09 07:55 UTC:
> What operating systems use local time as their basic clock these days?  Just
> wondering.

Any IBM PC compatible machine that runs under at least one Microsoft OS
has to keep the battery-backed CMOS clock chip in local time, because
unlike most other operating systems (e.g., any Unix flavour), none of
Microsoft's CMOS clock drivers have a UTC option. Rather disappointing
and every year an unneeded hassle after DST switches on multi-OS
machines. From discussions with Microsoft staff, I have to conclude that
no-one within Microsoft has even understood the problem.


Markus G. Kuhn, Computer Laboratory, University of Cambridge, UK
Email: mkuhn at acm.org,  WWW: <http://www.cl.cam.ac.uk/~mgk25/>

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