title: Difference between EST and America/New_York time zones
body: <p>Can somebody please tell, what's the difference between the following two statements:</p>
  
  <pre><code>TimeZone.getTimeZone("America/New_York")
  </code></pre>
  
  <p>and</p>
  
  <pre><code>TimeZone.getTimeZone("EST")
  </code></pre>
  
  <p>In other words, why is EST different from America/New_York. Also in my application, to get the current time zone in US, should I use America/New_York or EST.</p>