About: http://webisa.webdatacommons.org/210316334

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Implementing timedeltas and comparisons was a snap; I just downcast them into datetime dates, do the math there, and then make a new posical date with the result.
http://www.w3.org/ns/prov#wasQuotedFrom	zdsmith.com