I'd like to be able to set a user's timezone in my app, and the only way I can think to do that would be to ask for their local time and use that to calculate the offset. Is there any way to do this?I know that you can get the user's timezone with the getUserLocale action, but that just returns the IANA timezone identifier (e.g. America/Los_Angeles). I need the actual offset from GMT, which I can then use to set the user's timezone in my app.