diff --git a/models.rdf b/models.rdf
index 1943dd6..2b16547 100644
--- a/models.rdf
+++ b/models.rdf
@@ -12,7 +12,7 @@
 
     <rdf:Description rdf:about="http://pcdm.org/models#">
       <dcterms:title xml:lang="en">Portland Common Data Model</dcterms:title>
-      <dcterms:modified rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2016/04/18</dcterms:modified>
+      <dcterms:modified rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2016-04-18</dcterms:modified>
       <dcterms:publisher rdf:resource="http://www.duraspace.org/"/>
       <rdfs:seeAlso rdf:resource="https://github.com/duraspace/pcdm/wiki"/>
       <rdfs:comment xml:lang="en">Ontology for the Portland Common Data Model, intended to underlie a wide array of repository and DAMS applications.</rdfs:comment>