[release-branch.go1.17] time: fix looking for zone offset when date is close to a zone transition
The old implement passed start - 1 or end in func lookup to adjust the offset.But if the time is close to the last zoneTrans, like the issue, testcase and comment, the "start" from lookup will be omega. It can't be adjusted correctly.
Fixes #49407
Change-Id: Ibaf82dc4db6d5dd3279796f003d2b19c38a26341
Reviewed-on: https://go-review.googlesource.com/c/go/+/360616
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Robert Findley <rfindley@google.com>
(cherry picked from commit
90462dfc3aa99649de90bb587af56a9cb0214665)
Reviewed-on: https://go-review.googlesource.com/c/go/+/361955
Trust: Dmitri Shuralyov <dmitshur@golang.org>