new time conversion interface

[D. J. Bernstein]

Nathan Myers writes:
> I believe that conversions should yield a struct containing
> a reference timestamp, followed by up to four offsets tagged with
> official wall-clock offset, interpretation, and confidence values.  

How exactly do you expect programs to use this information?

I can imagine a warning such as ``The time is jumping from 2:00 CDT back
to 1:00 CST; I assume you meant 1:30 CDT; if you actually wanted 1:30
CST, type 1:30 CST.'' But this doesn't use your vague ``confidence
values''; it uses hard data about the time zone.

---Dan
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