JavaScript function to parse an ASP.NET JSON-serialised DateTime and extract the UNIX timestamp

dateutils.js

/**
 * Returns the UNIX timestamp from the ASP.NET JSON-serialised DateTime
 *
 * @param d - a string in the format /Date(1331127585489)/
 * @return UNIX timestamp extracted from d, or zero
 * @see http://www.hanselman.com/blog/OnTheNightmareThatIsJSONDatesPlusJSONNETAndASPNETWebAPI.aspx 
 * for possible changes to the way DateTime objects are serialised to JSON
 *
 * Example usage:
 * var jsonDateTime = '/Date(1331127585489)/';
 * console.log(new Date(parseUnixTime(jsonDateTime)));
 */
function parseUnixTime(d) {
  var tmp = d.match(/\d+/);
  if (tmp && tmp.length) {
    return parseInt(tmp[0]);
  }
  return 0;
}