time.Parse fails at parsing time.String

[Yndoendo]

time.Parse can not parse the default format produced by time.String()

What version of Go are you using (go version)?

go1.7.1 linux/amd64

What operating system and processor architecture are you using (go env)?

GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="$HOME/.local/share/go"
GORACE=""
GOROOT="/usr/lib/go"
GOTOOLDIR="/usr/lib/go/pkg/tool/linux_amd64"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build766838131=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="1"

What did you do?

https://play.golang.org/p/wmfQP5wX0S

func main() {
    t := time.Now().UTC()
    s := t.String()

    t, err := time.Parse(s,s)
    if err != nil {
        fmt.Println(s, "parsed with error", err)
    } else {
        fmt.Println(s, "equals", t.String())
    }
}

What did you expect to see?

2016-09-27 16:53:03.13465009 +0000 UTC equals 2016-09-27 16:53:03.13465009 +0000 UTC

What did you see instead?

There were different out comes, local:

2016-09-27 16:53:03.13465009 +0000 UTC parsed with error parsing time "2016-09-27 16:53:03.13465009 +0000 UTC": month out of range

go playground:

2009-11-10 23:00:00 +0000 UTC parsed with error parsing time "2009-11-10 23:00:00 +0000 UTC" as "2009-07-10 23:00:00 +0000 UTC": cannot parse "9-11-10 23:00:00 +0000 UTC" as "009"

[bradfitz]

Not a bug. The result of String is not a valid format.