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From: Ed Maste <emaste@freebsd.org>
Date: Thu, 13 Jun 2024 11:32:10 -0400
Message-ID: <CAPyFy2Ab1Sm7B7cnhHiPCwftOOZBj58249TFjPK8+6XGuq6sPA@mail.gmail.com>
Subject: Re: Removing "CMOS clock set to UTC" question
To: Tomoaki AOKI <junchoon@dec.sakura.ne.jp>
Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org>
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On Wed, 12 Jun 2024 at 18:51, Tomoaki AOKI <junchoon@dec.sakura.ne.jp> wrote:
>
> tzsetup(8) manpage is a bit confusing.
> Does `tzsetup -s` create /etc/wall_cmos_clock when it's not exist and
> selected timezone is NOT UTC?
No, with -s tzsetup neither creates nor removes /etc/wall_cmos_clock.
I've created https://reviews.freebsd.org/D45576 to clarify this in
tzsetup(8) and would appreciate review.
> Unfortunately, most of computers used by end-users (personal or
> corporate) would running Windows. Does emulated CMOS clocks on VMware,
> virtualBox and/or something else on Windows shows always UTC, or wall
> CMOS clock same as host Windows?
For the last 10 years we've skipped this question when running in a VM:
commit e91afc1cda50cbcb8fffa3f52cc0f8c595a392a3
Author: Devin Teske <dteske@FreeBSD.org>
Date: Tue Nov 11 19:37:17 2014 +0000
Default `bsdconfig timezone' and `tzsetup' to `-s' in a VM.
Recommended by: cperciva
Reviewed by: cperciva
Relnotes: tzsetup and bsdconfig now assume that the
"hardware" clock inside a VM is set to UTC
VirtualBox has an option to indicate that the RTC stores UTC time, I
assume others do as well. There's a VirtIO RTC interface that provides
(among others) a UTC clock.