Re: [Chicken-users] choosing right timezone for future date

[Kon Lovett]

On Jan 28, 2008, at 2:27 PM, John Cowan wrote:

> Graham Fawcett scripsit:
>
> > My TZ is set properly, and using strace I see that the correct
> > zoneinfo file is being accessed. "date +%Z" works properly. Any  
> > ideas?
<snip>
> However, this doesn't really solve your problem, because it sets
> the offset and tzname to the current values, not to the values in
> effect at the time.

The TZ database contains historical DST rules. The usual Unix  
suspects provide a compiled form (Windows doesn't use the TZ database),

SLIB has code to read the binary form (tzfile.scm) and use the info  
(timecore.scm & timezone.scm).

(I have been meaning to steal the algorithms for the srfi-19 egg.)

> I admit I don't know how to make progress here.  Let me think on it.
>
> --
> John Cowan  address@hidden   http://www.ccil.org/~cowan
> O beautiful for patriot's dream that sees beyond the years
> Thine alabaster cities gleam undimmed by human tears!
> America! America!  God mend thine every flaw,
> Confirm thy soul in self-control, thy liberty in law!
>         -- one of the verses not usually taught in U.S. schools
>
>
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Best Wishes,
Kon