Lua - get time and date of specific time zone

I want the time and date of a specific timezone in Lua, formatted in way, os.date("%a %b %d, %H:%M") would return it.

I know that os.date("!%a %b %d, %H:%M") (added exclamation mark "!") gives me UTC time but how do I move from there and offset the requested time?

In my case the desired timezone is UTC+08:00.