[tz] question about mktime_tzname()

[Arthur David Olson]

For the immediate question:

> I'm not quite sure what 'goback' and 'goahead' are supposed to do.

"goback" indicates that there's a 400-year pattern to the stuff at the
start of the transition table that can be extrapolated backward through
time; "goahead" indicates that there's a 400-year pattern to the stuff at
the end that can be extrapolated forward. When a table generated from an
environment variable does indeed cover 400 years, both goahead and goback
should be set.

    @dashdashado

On Wed, Jan 11, 2017 at 3:55 PM, Paul Eggert <eggert at cs.ucla.edu> wrote:

> On 01/11/2017 11:39 AM, Arthur David Olson wrote:
>
> > for such environment variables, in what year should application of
> > daylight saving start (or should it apply to all years, no matter how
> > far in the past)?
>
> Surely it should apply to all years. POSIX doesn't require this (POSIX
> specifies only behavior starting in 1970) but it would be odd for a
> permanent rule to spring into action only after 1969.
>
> The attached proposed patch does that, and fixes the problem for Kees
> Dekker's case. Does this look like the right thing in general? I'm not
> quite sure what 'goback' and 'goahead' are supposed to do.
>
>
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