<http://schema.org/dateModified>
"2014-04-04T16:41:09-04:00"^^<http://schema.org/Date>
<http://www.upi.com/Business_News/2014/04/04/US-builds-most-accurate-atomic-clock-could-keep-time-for-300-million-years/3151396641599/?st_rec=3371396644083>