[tz] Irish Standard Time vs Irish Summer Time
michael.h.deckers at googlemail.com
Fri Dec 8 20:12:55 UTC 2017
On 2017-12-08 08:26, Zefram wrote:
> That's not a change to the format that zic accepts.
Well, I did not mean the input accepted by
any particular implementation of zic but
the public interface described in zic(8),
the definition of the format of tzdb data.
If some zic implementation accepts complex
numbers as SAVE values that does not mean
we can use it in tzdb data.
> zic already does allow negative AT times.
Interesting. Allowing negative AT values would
provide a "convenient notation" to avoid the
Chatham Rules, as in
Rule NZ 2008 max - Apr Sun>=1 -10:00u 0 S
> zic.8 ought to be patched to make explicit that AT and SAVE have no
> small range limits.
Yes, and it may also be necessary to state the meaning
of such extensions; for instance, the suffixes u, g, z
currently are allowed for SAVE values but they
cannot really be used because it is not clear what
they are supposed to mean in this context.
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