On Mar 2, 2013, at 8:46 , Mark Davis ☕ wrote:
> The TZDB has the equivalence class {Asia/Calcutta Asia/Kolkata}. They used to
> have the former as the canonical name (in Zone), but then changed it to the
> latter. Here is the current TZDB data:
>
> zone.tab
>
> IN +2232+08822 Asia/Kolkata
>
> asia
>
> Zone Asia/Kolkata 5:53:28 - LMT 1880 # Kolkata
> ...
>
> backward
> Link Asia/Kolkata Asia/Calcutta
>
> Because of the Link, both are valid and equivalent.
>
>
> CLDR, because we need stability, retains the former TZID as the canonical
> name. That is the meaning of the first alias in
> http://unicode.org/repos/cldr/tags/release-22-1/common/bcp47/timezone.xml
> such as in:
>
> <type name="inccu" alias="Asia/Calcutta Asia/Kolkata" description="Kolkata,
> India"/>
>
> The short name (name="...") is only used for BCP47 subtags (because of the
> ASCII/8-char limit), not for communicating with TZDB implementations. Nor is
> it used in CLDR for the canonical ID.
>
> Instead Asia/Calcutta is used as the canonical ID.
That breaks if/when the tz database removes Asia/Calcutta from its Link list
and other systems using IANA names stop supporting (or never start supporting)
that name.
I still think the stability issue should be addressed in the IANA time zone
database itself, not by adopting a IANA-derived alternate registry. Has that
been tried?
Norbert
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