Re: strange time problem with bullseye

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From	Greg Wooledge <greg@wooledge.org>
Newsgroups	linux.debian.user
Subject	Re: strange time problem with bullseye
Date	Tue, 05 Mar 2024 22:50:01 +0100
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On Tue, Mar 05, 2024 at 08:28:49PM +0800, hlyg wrote:
> Thank Greg Wooledge!
> 
> zhou@debian:~$ date
> Wed 06 Mar 2024 04:07:02 AM CST
> zhou@debian:~$ date -u
> Tue 05 Mar 2024 08:07:07 PM UTC
> 
> above is from deb11 for i386, it's correct

OK, and your time zone is 20 hours ahead of UTC, it appears.

> zhou@debian:~$ date
> Tue 05 Mar 2024 08:13:23 PM CST
> zhou@debian:~$ date -u
> Tue 05 Mar 2024 12:13:27 PM UTC
> 
> above is from deb11 for amd64, it's wrong, utc lag behind by 4 hours

Now this is odd-looking.  In this instance, your time zone is 4 hours
*behind* UTC instead of 20 hours ahead.  Which makes it off by exactly
one whole day.

Also, it *looks* like your i386 instance wrote UTC to the system clock,
and then your amd64 instance read that as local time.  You can see that
the 8:07:07 PM from the first instance is quite close to the 8:13:23 PM
from the second.

> Windows shall not cause problem, i rarely use Windows

The question isn't how often you use it, but whether you booted it in
between the two instances above.  Probably not, I suppose.

> i don't know if ntp is running, what's default configuration by deb11 amd64
> installer?

There is no "default".  Or rather, there are lots of defaults.  It's not
useful to ask about defaults.  Ask about what you have.

These are the packages that provide time-daemon on Debian 11:

systemd-timesyncd
openntpd
ntp
chrony

If one of those is installed and running, it should set your clock from
Internet sources (assuming it's configured reasonably, and you have
Internet access).

But more importantly, you need to check whether your Debian instances are
using local time or UTC for the real time clock, because it *looks* like
the i386 one is using UTC and the amd64 is not.

Check your /etc/adjtime files.

I'm also extremely curious why two different systems report "CST" with
two wildly different offsets from UTC.  What does
"ls -ld /etc/localtime" give on your systems?  Are they both the same?

Thread

Re: strange time problem with bullseye Greg Wooledge <greg@wooledge.org> - 2024-03-05 21:00 +0100
  Re: strange time problem with bullseye Greg Wooledge <greg@wooledge.org> - 2024-03-05 22:50 +0100
  Re: strange time problem with bullseye Jeffrey Walton <noloader@gmail.com> - 2024-03-06 04:10 +0100

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