Unix, Xenix and ODT General FAQ
This article is from a FAQ concerning SCO operating
systems. While some of the information may be applicable to any OS,
or any Unix or Linux OS, it may be specific to SCO Xenix, Open
There is lots of Linux, Mac OS X and general Unix info elsewhere on
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way to find anything.
Because it needs to be running at the time that "setclk" is run
by crontab (3:01 AM by default). So if you are in the habit of not
leaving your machine running at night, the change will not be
John Dubois explains: Because the time reported by the CMOS
(motherboard) clock is *local time*, and local time includes the
effects of DST. It has to, because the BIOS interprets it this way;
if the OS tried to leave the CMOS clock set to non-DST time, the
BIOS would report the wrong time and admins would "fix" it when
they noticed the wrong time being reported.
So, if the system is booted and sees that it's July and 15:10,
then it's July and 15:10. If it's booted and sees that the time is
November and 15:12, it's November and 15:12. There is no attempt to
shift time from what the CMOS clock reports. The CMOS clock is kept
in sync with local time by adjusting it back or forward as
neccessary when the DST transitions occur, via that /etc/setclk
command in crontab. But this obviously only occurs if the system is
running at the right time.
SCO TIMEZONE changes
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