How to List Available Time Zones in Go for HTML Templates?

Listing Available Time Zones in Go for HTML Templates

In web applications, displaying a list of time zones and allowing users to select their preferred one is a common feature. In Go, the time.Format() function offers a convenient way to format time values according to specified time zones. However, retrieving a list of valid time zones can be somewhat tedious.

To obtain a comprehensive list of time zones in Go, you can traverse the system's time zone directories. The following code sample demonstrates how to achieve this:

package main

import (
    "fmt"
    "os"
    "strings"
)

var zoneDirs = []string{
    "/usr/share/zoneinfo/",
    "/usr/share/lib/zoneinfo/",
    "/usr/lib/locale/TZ/",
}

var zoneDir string

func main() {
    for _, zoneDir = range zoneDirs {
        ReadFile("")
    }
}

func ReadFile(path string) {
    files, _ := os.ReadDir(zoneDir + path)
    for _, f := range files {
        if f.Name() != strings.ToUpper(f.Name()[:1]) + f.Name()[1:] {
            continue
        }
        if f.IsDir() {
            ReadFile(path + "/" + f.Name())
        } else {
            fmt.Println((path + "/" + f.Name())[1:])
        }
    }
}

Once you have this list, you can populate an HTML template with available time zones using a select element, allowing users to conveniently choose their preferred time zone.

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