[tz] Unexpected last transition in Africa/Casablanca

Stephen Colebourne scolebourne at joda.org
Thu May 19 12:54:14 UTC 2022

On Wed, 18 May 2022 at 18:41, Paul Eggert via tz <tz at iana.org> wrote:
> What would it take to get this fixed properly in Android and ICU and
> Java, and to support negative DST and all that? I know this can't be
> fixed overnight, but what would it take for a fix in the long run?

It will never be "fixed". Because from our perspective TZDB is broken,
not Java/Android/ICU.

Key here is that Java (and thus indirectly Android) and ICU take
backwards compatibility more seriously than TZDB. The DST flag has a
specific meaning to Java, and there is no interest in whether a
location has positively or negatively defined DST rules.

For global-tz, I simply publish the standard and rearguard versions
for consumers to pick from.

Perhaps TZDB could remove negative DST from the data and just refer to
it only in comments? Maybe that way you could remove rearguard.


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