time.RFC3339* cannot be parsed using time.RFC3339* as a format in time.Parse

[apghero]

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

$ go version
go version go1.14.2 darwin/amd64

Does this issue reproduce with the latest release?

Yes. This is also reproducible in the Playground: https://play.golang.org/p/smwSOLsFO7I

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

go env Output

$ go env
$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="${HOME}/Library/Caches/go-build"
GOENV="${HOME}/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="${HOME}/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="${HOME}/Devel/testtime/go.mod"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/jr/fk19fknn1yg5cp_02cymxv0c0000gq/T/go-
build660913494=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

https://play.golang.org/p/smwSOLsFO7I

What did you expect to see?

I expected to see time.RFC3339 being parsed correctly into a time.Time.

What did you see instead?

I get an error that the input string time.RFC3339 is not actually parsable as time.RFC3339.

[apghero]

OK, reading through RFC3339, it looks like you are required to put a -/+ for the time-offset, so this is an unexpected, but correct behavior, unfortunately. 😞