golang docker time lib无法正常工作

Question

I may have missed something, but on my local system, everything behaves as expected, but in the container, something seems off

main.go

package main

import (
    "fmt"
    "time"
)

func main() {
    t, err := time.Parse(time.RFC1123, "Fri, 22 Jun 2018 13:00:00 KST")
    if err != nil {
        panic(err)
    }

    fmt.Println(t.String())
    fmt.Println(t.UTC().String())
    fmt.Println(t.UTC().Equal(t))
}

Dockerfile

FROM golang:latest

COPY main.go /go/src/test/main.go
WORKDIR /go/src/test

CMD go run main.go

On my local system, the output from this program is:

2018-06-22 13:00:00 +0900 KST
2018-06-22 04:00:00 +0000 UTC
true

but if I build and run it in a container I get this:

2018-06-22 13:00:00 +0000 KST
2018-06-22 13:00:00 +0000 UTC
true

which seems to be converting the timezone to UTC, but it is not changing they time so they are not equal