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Re: [Qemu-devel] Changing RTC from UTC to local time
From: |
Flavien |
Subject: |
Re: [Qemu-devel] Changing RTC from UTC to local time |
Date: |
Sun, 30 May 2004 23:59:49 +0200 |
User-agent: |
Mutt/1.5.5.1+cvs20040105i |
Hello,
Bartosz Fabianowski wrote :
>
> You can set a PC's RTC to UTC or any other time zone for that
> matter if you want to. However, according to the original
> design (dating back to the olden days of the first IBM PC), the
> RTC should be running in local time.
Just a thought :
There is a problem with setting RTC to local time with daylight
savings, when running multiple OSs on the same hardware.
If an OS expects RTC clock to be local, then you'd better only
one OS on that system, otherwise you'll get into trouble twice a
year. Example :
1/ Install two instances of windows on the same machine,
2/ Only boot one of them daily for 6 months,
3/ Wait for daylight saving time, still working with that same
version of windows : It will change RTC clock and run fine.
4/ Boot the other windows : It will think "oh, I have'nt been run
for a long time. And what happened during that time ? Time
changed ! So, let's change RTC clock !". Your RTC clock will
have been change twice.
Conclusion : setting RTC to local time is a _broken_ concept.
Flavien.
- Re: [Qemu-devel] Changing RTC from UTC to local time, (continued)
- Re: [Qemu-devel] Changing RTC from UTC to local time, Bartosz Fabianowski, 2004/05/30
- Re: [Qemu-devel] Changing RTC from UTC to local time, Kyle Hayes, 2004/05/30
- Re: [Qemu-devel] Changing RTC from UTC to local time, Pavel Janík, 2004/05/31
- Re: [Qemu-devel] Changing RTC from UTC to local time, Bartosz Fabianowski, 2004/05/31
- Re: [Qemu-devel] Changing RTC from UTC to local time, Fabrice Bellard, 2004/05/31
- Re: [Qemu-devel] Changing RTC from UTC to local time, Derek Fawcus, 2004/05/31
- Re: [Qemu-devel] Changing RTC from UTC to local time, Tim, 2004/05/31
- Re: [Qemu-devel] Changing RTC from UTC to local time, Pavel Janík, 2004/05/31
- Re: [Qemu-devel] Changing RTC from UTC to local time, Kyle Hayes, 2004/05/31
- Re: [Qemu-devel] Changing RTC from UTC to local time, Bartosz Fabianowski, 2004/05/31
- Re: [Qemu-devel] Changing RTC from UTC to local time,
Flavien <=
- Re: [Qemu-devel] Changing RTC from UTC to local time, Bartosz Fabianowski, 2004/05/30
- Re: [Qemu-devel] Changing RTC from UTC to local time, Kyle Hayes, 2004/05/30
- Re: [Qemu-devel] Changing RTC from UTC to local time, Bartosz Fabianowski, 2004/05/31