Fixed bug in xmlparser.py (Issue #1324) (#1325)

* Update xmlparser.py

* Update xmlparser.py

asyncua/common/xmlparser.py

@@ -459,7 +459,9 @@ class XMLParser:
                 date_time = model.attrib.get('PublicationDate')
                 if date_time is None:
                     date_time = ua.DateTime(1, 1, 1)
-                else:
+                elif date_time is not None and date_time[-1]=="Z":
                     date_time = ua.DateTime.strptime(date_time, "%Y-%m-%dT%H:%M:%SZ")
+                else:
+                    date_time = ua.DateTime.strptime(date_time, "%Y-%m-%dT%H:%M:%S%z")
                 ns.append((uri, version, date_time))
         return ns