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time: LoadLocationFromTZData with slim tzdata uses incorrect zone [1.15 backport] #44617

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gopherbot opened this issue Feb 25, 2021 · 3 comments
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time: LoadLocationFromTZData with slim tzdata uses incorrect zone [1.15 backport] #44617

gopherbot opened this issue Feb 25, 2021 · 3 comments
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CherryPickApproved Used during the release process for point releases FrozenDueToAge
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Go1.15.10

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@gopherbot
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@ianlancetaylor requested issue #44385 to be considered for backport to the next 1.15 minor release.

@gopherbot Please open backport issues.

We mishandle a couple of cases in the time extension strings used by the slim tzdata format. The slim format is likely to appear on more and more systems going forward, and is what we use when people use the time/tzdata package.
@gopherbot gopherbot added the CherryPickCandidate Used during the release process for point releases label Feb 25, 2021
@gopherbot gopherbot mentioned this issue Feb 25, 2021
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@gopherbot gopherbot added this to the Go1.15.9 milestone Feb 25, 2021
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Change https://golang.org/cl/297229 mentions this issue: [release-branch.go1.15] time: correct unusual extension string cases

@dmitshur dmitshur mentioned this issue Mar 1, 2021
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dmitshur commented Mar 1, 2021

Approving as a serious issue without a workaround. This backport applies to both 1.16 (#44618) and 1.15 (this issue).

@dmitshur dmitshur added CherryPickApproved Used during the release process for point releases and removed CherryPickCandidate Used during the release process for point releases labels Mar 1, 2021
gopherbot pushed a commit that referenced this issue Mar 1, 2021
@ianlancetaylor @dmitshur
[release-branch.go1.15] time: correct unusual extension string cases
6bb9600 
This fixes two uncommon cases.

First, the tzdata code permits timezone offsets up to 24 * 7, although
the POSIX TZ parsing does not. The tzdata code uses this to specify a
day of week in some cases.

Second, we incorrectly rejected a negative time offset for when a time
zone change comes into effect.

For #44385
Fixes #44617

Change-Id: I5f2efc1d385e9bfa974a0de3fa81e7a94b827602
Reviewed-on: https://go-review.googlesource.com/c/go/+/296392
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
(cherry picked from commit d9fd38e)
Reviewed-on: https://go-review.googlesource.com/c/go/+/297229
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Closed by merging 6bb9600 to release-branch.go1.15.

@toothrot toothrot modified the milestones: Go1.15.9, Go1.15.10 Mar 10, 2021
@golang golang locked and limited conversation to collaborators Mar 10, 2022
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