Convert UTC to "local" time in Go

Question

How can I convert UTC time to local time?

I've created a map with the UTC difference for all the countries I need the local time. Then I add that difference as duration to the current time (UTC) and print the result hoping that's the local time of that specific country.

For some reasons the result is wrong. For example with Hungary there is one hour difference. Any idea why I'm getting incorrect results?

package main

import "fmt"
import "time"

func main() {

    m := make(map[string]string)
    m["Hungary"] = "+01.00h"

    offSet, err := time.ParseDuration(m["Hungary"])
    if err != nil {
        panic(err)
    }
    t := time.Now().UTC().Add(offSet)
    nice := t.Format("15:04")

    fmt.Println(nice)
}

Answer 1

Keep in mind that the playground has the time set to 2009-11-10 23:00:00 +0000 UTC, so it is working.

The proper way is to use time.LoadLocation though, here's an example:

var countryTz = map[string]string{
    "Hungary": "Europe/Budapest",
    "Egypt":   "Africa/Cairo",
}

func timeIn(name string) time.Time {
    loc, err := time.LoadLocation(countryTz[name])
    if err != nil {
        panic(err)
    }
    return time.Now().In(loc)
}

func main() {
    utc := time.Now().UTC().Format("15:04")
    hun := timeIn("Hungary").Format("15:04")
    eg := timeIn("Egypt").Format("15:04")
    fmt.Println(utc, hun, eg)
}