[RFR] [8u262] JDK-8243541: (tz) Upgrade time-zone data to tzdata2020a

[Martin Buchholz]

Looks good.  At Google we also unsurprisingly used rearguard tzdata for jdk8.

On Tue, Jun 9, 2020 at 4:52 PM Andrew Hughes <gnu.andrew at redhat.com> wrote:
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8243541
> Webrev: https://cr.openjdk.java.net/~andrew/openjdk8/8243541/webrev.01/
>
> This patch updates the tzdata in OpenJDK 8u to the 2020a release. Unlike
> in OpenJDK 11 and later, this version uses the rearguard format. I did
> start looking at backporting JDK-8212970 to switch 8u to vanguard
> format, but it ended up developing into more of a rewrite than a
> backport. As such, I'll finish that up & propose it for 8u272, while
> this update is for 8u262 and I'll flag with jdk8u-critical-fix once
> reviewed.
>
> Differences from the 11u/15u version:
>
> * The rules for Morocco and Namibia are in rearguard format (no negative
> offsets). This data was generated from the tzdata2020a release and
> running 'make rearguard_tarballs' as specified in the copy of the
> release notes in the bug. The updated files were then concatenated onto
> the appropriate Oracle boilerplate and copied over the 8u tzdata2019c files.
> * test/java/time/test/java/time/format/ZoneName.java in 8u is a mess. I
> added the new aliases to the alias map for this update, but I'll look
> whether JDK-8189784 (or at least the test part, as it's an 8->9
> regression) & JDK-8201507 are worth backporting.
> * We also update the copy of the tzdata in test/sun/util/calendar/zi.
> JDK-8212970, the vanguard patch, also removes this and makes the test
> use the make/data/tzdata copy instead. This is why updating this was
> missed when backporting tzdata2019b & tzdata2019c, leading to this being
> an update from tzdata2019a to tzdata2020a.
>
> The test/sun/util/calendar/zi & test/java/time/test/java/time tests
> passed after applying this patch.
>
> Thanks,
> --
> Andrew :)
>
> Senior Free Java Software Engineer
> Red Hat, Inc. (http://www.redhat.com)
>
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