2.2.4.1 dsc:DateTimeExtType

The dsc:DateTimeExtType type allows extended attributes on an xs:dataTime type (as specified in [XMLSCHEMA1] and [XMLSCHEMA2]). The server SHOULD use the current local time when setting time values.

 <xs:complexType name="DateTimeExtType">
    <xs:simpleContent>
       <xs:extension base="xs:dateTime">
          <xs:anyAttribute namespace="##other" processContents="lax"/>
       </xs:extension>
    </xs:simpleContent>
 </xs:complexType>