title: NSTimeZone: Any difference between "UTC" and "GMT"?
body: <p>Are these five statements interchangeable, or is anyone aware of cases where their use would yield different results? From what I gather they are equivalent but I haven't found anything conclusive, and potential differences between the GMT and the UTC variants worry me.</p>
  
  <pre><code>[NSTimeZone timeZoneWithName:@"GMT"];
  [NSTimeZone timeZoneWithName:@"UTC"];
  [NSTimeZone timeZoneWithAbbreviation:@"GMT"];
  [NSTimeZone timeZoneWithAbbreviation:@"UTC"];
  [NSTimeZone timeZoneForSecondsFromGMT:0];
  </code></pre>