<http://schema.org/dateModified>
"2014-02-03T19:21:00-05:00"^^<http://schema.org/Date>
<http://www.upi.com/Science_News/2014/02/03/Pyramid-found-in-Egypt-is-older-than-Gizas-Great-Pyramid/UPI-86741391473260/?spt=mps&or=4>