title: Is there a service for converting IP address to timezone name?
body: <p>I'm finding a service that converts IP address of clients into timezone names for use in a Rails web app. I found a couple of them, like <a href="http://www.ipinfodb.com/ip_location_api_json.php" rel="nofollow">ipinfodb</a>, but they just provide the timezones <strong>"time offset"</strong> (e.g. +0700). But what I need is the actual <strong>timezone name</strong> or, at least, its <strong>abbreviation</strong> (e.g. Indochina Time or ICT). Is there any API out there, or may be a database that I can use for this? </p>
  
  <p>I need to match the timezone of two objects. Those timezones can be anywhere in the world. One of them is a <strong>ActiveSupport timezone name</strong>, BUT another one is just a <strong>time offset</strong>. And time offset doesn't have <strong>DST</strong> information I need so I can't match them correctly.</p>