Plea to Microsoft to allow RTC=UTC

Antoine Leca AntoineLeca at
Tue Jul 3 08:50:33 UTC 2001

Hi Markus,

Markus Kuhn ha escrit:
> I have managed to get someone inside Microsoft interested in the
> problems of the old MS-DOS convention of keeping the RTC in some local
> time that is not further specified in the CMOS RAM data. I was asked to
> write up a case to convince Microsoft management to dedicate resources
> for fixing this and enabling the Windows RTC driver to maintain the
> battery clock in Universal Time instead of local time.
> I just did so on
> and I would like to invite all computer time gurus out there to review
> this brief essay before I send it off to Redmond.

Several (minor) points:

> Please let me know if you have any further
>  - arguments
>  - technical suggestions/proposals
>  - related references
>  - URLs of well-documented RTC DST problem stories
> that you think that whoever at Microsoft touches the Windows RTC code
> next should be aware of.
> Cheers,
> Markus
> --
> Markus G. Kuhn, Computer Laboratory, University of Cambridge, UK
> Email: mkuhn at,  WWW: <>

More information about the tz mailing list