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Re: Does Dimdows Know What Time It Is?

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On Sat, 28 Sep 2024 22:40:24 -0000 (UTC), Lawrence D'Oliveiro
<ldo@nz.invalid> wrote in <vda0ko$1e457$1@dont-email.me>:

> Something Unix did that was different from most other OSes was, its
> system clock kept time in UTC (or GMT, in pre-UTC days). Linux does the
> same.
> When you use a command like “date” to see what the current date and time
> is, it converts that UTC time to a local time in some specified
> timezone. Changing the timezone is as easy as specifying a new value for
> the TZ environment variable.
> 
> Windows, on the other hand, keeps its system clock in local time, in
> some specific time zone that is assumed to apply systemwide.
> 
> This is a particularly dumb idea when you realize how much it
> complicates things if your time zone has daylight saving time. We have
> seen this sort of thing happen on Windows systems before, where they
> might forget to adjust the clock to start/stop daylight saving, or even
> adjust it twice so you end up being an hour off in the opposite
> direction.
> 
> This can’t happen on Linux systems, because there is no turning daylight
> saving “on” or “off” as such: there is simply a table of local time
> offsets (from the “tzdata” files), and the correct offset to apply
> depends only on the actual UTC time value, not on the current setting of
> any system flag.
> 
> This also makes it easy to convert between UTC and local times at any
> time in the past, for any time zone.

$ echo $TZ

$ ls -l /etc/localtime
lrwxrwxrwx 1 root root 39 Jul 16 07:50 /etc/localtime -> /usr/share/zoneinfo/America/Los_Angeles

-- 
-v

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Does Dimdows Know What Time It Is? Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-09-28 22:40 +0000
  Re: Does Dimdows Know What Time It Is? vallor <vallor@cultnix.org> - 2024-09-28 23:21 +0000
    Re: Does Dimdows Know What Time It Is? Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-09-28 23:59 +0000
  Re: Does Dimdows Know What Time It Is? DFS <nospam@dfs.com> - 2024-09-29 14:59 -0400
    Re: Does Dimdows Know What Time It Is? Stéphane CARPENTIER <sc@fiat-linux.fr> - 2024-09-29 20:04 +0000
    Re: Does Dimdows Know What Time It Is? CrudeSausage <crude@sausa.ge> - 2024-09-29 20:44 -0400
      Re: Does Dimdows Know What Time It Is? RonB <ronb02NOSPAM@gmail.com> - 2024-09-30 06:34 +0000
        Re: Does Dimdows Know What Time It Is? CrudeSausage <crude@sausa.ge> - 2024-09-30 10:05 -0400
          Re: Does Dimdows Know What Time It Is? RonB <ronb02NOSPAM@gmail.com> - 2024-10-01 05:19 +0000
            Re: Does Dimdows Know What Time It Is? CrudeSausage <crude@sausa.ge> - 2024-10-01 08:58 -0400
    Re: Does Dimdows Know What Time It Is? Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-09-30 01:24 +0000
      Re: Does Dimdows Know What Time It Is? candycanearter07 <candycanearter07@candycanearter07.nomail.afraid> - 2024-09-30 19:40 +0000
    Re: Does Dimdows Know What Time It Is? Chris Ahlstrom <OFeem1987@teleworm.us> - 2024-09-30 06:59 -0400
      Re: Does Dimdows Know What Time It Is? chrisv <chrisv@nospam.invalid> - 2024-10-01 07:07 -0500
    Re: Does Dimdows Know What Time It Is? Joel <joelcrump@gmail.com> - 2024-10-01 08:26 -0400

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