title: How to get the current time zone?
body: <p>In most of the examples I had seen:</p>
  
  <pre><code>time_zone_ptr zone( new posix_time_zone("MST-07") ); 
  </code></pre>
  
  <p>But I just want to get the current time zone for the machine that runs the code. I do not want to hard code the time zone name.</p>