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time: document an alternative way of setting the system's time zone

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User's program was mutating time.Local variable and crashing
itself as a consequence. Instead of documenting that time.Local
variable should not be mutated, recommended way of setting the
system's time zone has been documented.

Fixes #34814

Change-Id: I7781189855c3bf2ea979dfa07f86c283eed27091
Reviewed-on: https://go-review.googlesource.com/c/go/+/200457
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Domas Tamašauskas 2019-10-10 21:54:18 +03:00 committed by Ian Lance Taylor
parent 4ff45821ae
commit 9bde9b4d15
1 changed files with 5 additions and 0 deletions
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5
src/time/zoneinfo.go
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@ -65,6 +65,11 @@ var UTC *Location = &utcLoc
var utcLoc = Location{name: "UTC"}
// Local represents the system's local time zone.
// On Unix systems, Local consults the TZ environment
// variable to find the time zone to use. No TZ means
// use the system default /etc/localtime.
// TZ="" means use UTC.
// TZ="foo" means use file foo in the system timezone directory.
var Local *Location = &localLoc
// localLoc is separate so that initLocal can initialize