time: support colon at start of TZ value
According to POSIX, there are three formats for TZ variable. When it refers to timezone file, it should starts with a colon. This commit removes the colon if it exists, so that it keeps compatible with both the spec and the old behavior. Change-Id: I30cfeaea530d24e174de309952338cb1146694a5 GitHub-Last-Rev: 11d83d11ca2eca9d542036cf5e23559388fd323e GitHub-Pull-Request: golang/go#27570 Reviewed-on: https://go-review.googlesource.com/c/go/+/134217 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by:Ian Lance Taylor <iant@golang.org> Trust: Dmitri Shuralyov <dmitshur@golang.org>
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