This module consists of a Service Action GetTimezones that returns all timezones with:

-Zone Name (example "America/Aruba")

-Country Code (example  "AW")

-Country Name (in English, example "Aruba")

-GMT Offset (in seconds, example: -14400)

-GMT Offset Label (offset as text, example "GMT-04:00")

They are sorted first by offset and second alphabetically.

To feed the table the first time you need to run the single timer Timer_ImportTimeZones.

But for that, first you need to register and get an API key from https://timezonedb.com/ and set it in Site Properties. Don't worry, it is free.

The timer will take just one second and after that, you will have a list of 418 timezones to use as you wish