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How do I convert the number of milliseconds since January 1, 1970, 00:00:00 into its corresponding date (dd/mm/yy format)?

The following JavaScript method provides this functionality: 

<html>
  <head>
    <script language="JavaScript">

      function convertMillisecondsToFormattedDate(milliseconds) {
        var date = new Date(milliseconds);
        var day = date.getDate();
        var month = date.getMonth()+1;
        var year = getFullYear();

        return day + '/' + month + '/' + year;
      }
    </script>
  </head>
  <body>
    <input type="button" value="display date" 
      onclick="alert(convertMillisecondsToFormattedDate(925241310748));"/>
  </body>
</html>

Notice that you have to pass a Date object into the daysElapsed method and not String values.