<http://schema.org/dateModified>
"2014-04-04T18:05:21-04:00"^^<http://schema.org/Date>
<http://www.upi.com/Entertainment_News/2014/04/04/Sources-say-Stephen-Colbert-is-CBSs-top-choice-to-replace-David-Letterman/UPI-1271396646403/>