title: Git: show dates in UTC
body: <p>The following command shows some metadata about the last git commit in json format:</p>
  
  <pre><code>git show --quiet HEAD --pretty=format:"{\"hash\":\"%h\", \"author\":\"%cn\", \"commit date\":\"%cd\"}"
  
  {
    "hash":"0fc0fc0", 
    "author":"Adam Matan",
    "commit date":"Sun Jan 26 12:26:19 2014 +0200"}
  }
  </code></pre>
  
  <p>Is there a way to present the date in the UTC/GMT time zone, e.g. <code>"Sun Jan 26 10:26:19 2014"</code> ?</p>