title: Parsing unix timestamp with RestKit in iOS
body: <p>For an iOS app I am working on with RestKit I need to parse a unix timestamp
  changed = "1325470840" into an NSDate. I know that I can manually do this with </p>
  
  <pre><code>[NSDate dateWithTimeIntervalSince1970:1325470840]
  </code></pre>
  
  <p>But I am using RestKits core data integration and this is handled behind the scenes using date formatters, such as below.</p>
  
  <pre><code>[RKObjectMapping addDefaultDateFormatterForString:@"E MMM d HH:mm:ss Z y" inTimeZone:nil];
  </code></pre>
  
  <p>Does anyone know how to create a date formatter to parse a unix timestamp? Or how I could go about parsing this with RestKit?</p>