How Can I Get a List of Usable Time Zones for Go\'s time.Format()?

Getting a List of Usable Time Zones for Go's time.Format()

For providing users a convenient way to select time zones in your applications, you may need to populate a dropdown with a list of valid time zones. This list can be generated with a straightforward method in Go.

Solution:

To obtain a comprehensive list of commonly supported time zones that can be used with the time.Format() function, you can employ the following code:

package main

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

var zoneDirs = []string{
    // Update path according to your OS
    "/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:])
        }
    }
}

Explanation:

• This code loops through potential time zone directories to locate valid time zones.
• It reads the directory contents and ignores entries with mixed casing.
• If an entry is a directory, it recursively calls the ReadFile function to continue searching.
• Time zone names are then printed without the leading slash.

Output:

Executing the code will produce a list of time zone names, such as:

Africa/Abidjan
Africa/Accra
Africa/Addis_Ababa
Africa/Algiers
Africa/Asmara
...

You can incorporate this list into your HTML template for a user-friendly time zone selection feature.

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