Go timezone bug (fixed in master) with current Alpine tzdata

README.md

How to reproduce

docker build -t timezone-bug:dev .
docker run --rm timezone-bug:dev

Dockerfile

FROM golang:1.15 as builder

WORKDIR /app

COPY . .

RUN CGO_ENABLED=0 go build -o bin/test

# ---

FROM alpine:3.12

RUN apk update &&\
    apk --no-cache add tzdata &&\
    rm -rf /var/cache/apk/*

COPY --from=builder /app/bin/test /app/test

CMD ["/app/test"]

main.go

package main

import (
	"fmt"
	"os"
	"time"
)

func main() {
	loc, err := time.LoadLocation("Europe/Berlin")
	if err != nil {
		failErr(fmt.Errorf("loading location %s: %v", "Europe/Berlin", err))
	}

	d := time.Date(2020, time.October, 29, 15, 30, 0, 0, loc)

	expectedDate := "2020-10-29 15:30:00 +0100 CET"
	actualDate := d.String()

	if expectedDate != actualDate {
		failErr(fmt.Errorf("expected %s, but date was interpreted as %s", expectedDate, actualDate))
	}
}

func failErr(err error) {
	fmt.Fprintf(os.Stderr, "Error: %v\n", err)
	os.Exit(1)
}