[tz] Changing 24:00 to 0:00 where possible

[Arthur David Olson]

> Since the very beginning of this project, there has been a standard
> parsed data format (now called "TZif") and the `zic` utility has been
> shipped to do the parsing.  Indeed, for a long time, the behavior of
> `zic` was the only specification of the human-readable data format.

Indeed there was no standards-organization documentation in the early days;
the only thing available was a manual entry (tzfile.5); that entry did not
always capture the complete picture.

    @dashdashado

On Tue, Apr 4, 2023 at 3:57 PM Garrett Wollman via tz <tz at iana.org> wrote:

> <<On Tue, 04 Apr 2023 12:45:54 -0700, Brian Park via tz <tz at iana.org>
> said:
>
> > I am curious to hear that your TZDB parsing is exposed to your
> > end-users and is in the critical path. I would have thought that the
> > parsing would be done offline (e.g. after each TZDB release), and
> > the TZDB data would be converted into a different format that is
> > more amenable to the computation that your code is performing.
>
> Since the very beginning of this project, there has been a standard
> parsed data format (now called "TZif") and the `zic` utility has been
> shipped to do the parsing.  Indeed, for a long time, the behavior of
> `zic` was the only specification of the human-readable data format.
>
> Of course, this format was designed for easy access by the C standard
> library routines and not by JavaScript, but it would in theory not be
> difficult to modify the `zic` source code to generate a different
> output format that was more amenable to document-processing languages.
>
> -GAWollman
>
>
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