Fix

src/SQL2Linked/Implementations/ProjectStructuralData.cs

@@ -142,12 +142,16 @@ namespace SQL2Linked.Implementations
                     }
                 }
 
+                if (entry.Creator is not null)
+                {
                     AssertToGraphUriNode(graph, projectGraphName, dcterms + "creator", cosc + $"users/{entry.Creator}");
                     Console.WriteLine($"For project '{entry.DisplayName}' will migrate triple '{projectGraphName} {dcterms}creator {cosc}users/{entry.Creator}'. ");
+                }
+
 
                 if (entry.DateCreated is not null && entry.DateCreated.HasValue)
                 {
-                    AssertToGraphLiteralNode(graph, projectGraphName, dcterms + "created", entry.DateCreated.Value.ToString());
+                    AssertToGraphLiteralNode(graph, projectGraphName, dcterms + "created", entry.DateCreated.Value.ToString(), new Uri("http://www.w3.org/2001/XMLSchema#dateTime"));
                     Console.WriteLine($"For project '{entry.DisplayName}' will migrate triple '{projectGraphName} {dcterms}created {entry.DateCreated}'. ");
                 }