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Ian Lance Taylor 06c9756333 [release-branch.go1.15] time: use offset and isDST when caching zone from extend string
If the current time is computed from extend string
and the zone file contains multiple zones with the
same name, the lookup by name might find incorrect
zone.

This happens for example with the slim Europe/Dublin
time zone file in the embedded zip. This zone file
has last transition in 1996 and rest is covered by
extend string.
tzset returns IST as the zone name to use, but there
are two records with IST name. Lookup by name finds
the wrong one. We need to check offset and isDST too.

In case we can't find an existing zone, we allocate
a new zone so that we use correct offset and isDST.

I have renamed zone variable to zones as it shadowed
the zone type that we need to allocate the cached zone.

Backport note: this change also incorporates portions of
CL 264077.

For #45370
Fixes #45384

Change-Id: I43d416d009e20878261156c821a5784e2407ed1f
Reviewed-on: https://go-review.googlesource.com/c/go/+/307212
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
2021-04-12 21:24:29 +00:00
.github .github: add link to questions in ISSUE_TEMPLATE 2020-01-06 17:05:31 +00:00
api go/printer: remove exported StdFormat flag 2020-07-17 02:15:01 +00:00
doc [release-branch.go1.15] doc/go1.15: mention 1.15.3 cgo restriction on empty structs 2020-12-16 04:10:01 +00:00
lib/time lib/time, time/tzdata: update tz data to 2020a 2020-04-30 08:07:39 +00:00
misc [release-branch.go1.15] cmd/link: avoid exporting all symbols on windows buildmode=pie 2021-03-31 21:39:47 +00:00
src [release-branch.go1.15] time: use offset and isDST when caching zone from extend string 2021-04-12 21:24:29 +00:00
test [release-branch.go1.15] cmd/compile: disable shortcircuit optimization for intertwined phi values 2021-03-31 14:33:56 +00:00
.gitattributes all: treat all files as binary, but check in .bat with CRLF 2020-06-08 15:31:43 +00:00
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AUTHORS A+C: add Kush Patel (corporate CLA for Hootsuite Inc) 2020-07-08 00:10:44 +00:00
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CONTRIBUTORS [release-branch.go1.15] all: merge master into release-branch.go1.15 2020-08-11 17:05:57 +00:00
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VERSION [release-branch.go1.15] go1.15.11 2021-04-01 17:26:12 +00:00

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