code: function parseUpdatedDate (node, nodeType, feedType) {
    var propOrder;
  
    if (feedType === 'rss') {
      propOrder = nodeType === 'meta' ? ['lastbuilddate'] : ['a10:updated'];
    } else if (feedType === 'atom') {
      propOrder = ['updated'];
    } else if (feedType === 'rdf') {
      propOrder = ['modified'];
    }
  
    var dateString = utils.getFirstFoundPropValue(node, propOrder);
  
    if (dateString) {
      return utils.getDate(dateString);
    }
  }
docs: Parses the most/recent updated date for meta and item nodes.
  
  - lastbuilddate
  - most frequent in RSS feeds and meta nodes
  - a10:updated
  - infrequent but provides updated date in RSS in item nodes
  - updated
  - most frequent in ATOM feeds and meta and item nodes
  - modified
  - most frequent in RDF feeds in meta and item nodes
  
  @param node
  @param nodeType
  @param feedType
  @returns {*}