title: How to get timezone by IP
body: <p>I have a registration by which i can get the IP address of user who registers.</p>
  
  <p>I want to get the timezone of user by his IP address.</p>
  
  <p>Like in jquery we can get like this 
  <a href="http://pellepim.bitbucket.org/jstz/">Timezone in jquery</a></p>
  
  <p>How can i do it in PHP.</p>