pubDate and lastBuildDate do not display in channel section of XML output

I couldn't get pubDate or lastBuildDate to display in the feed display of my view. I found the issue on line 113 of views_rss_core.inc but not sure if this has other implications in the code:

  $key = strtolower($variables['elements'][0]['key']);

If I remove the strtolower() function, the pubDate and lastBuildDate work fine as they need uppercase letter(s) in them to be referenced properly by their respective variables $row->pubDate and $row->lastBuildDate.