<?xml version="1.0" encoding="UTF-8"?>
<iq id="baz68-73519" type="set">
   <query xmlns="urn:xmpp:mam:0" queryid="q92">
      <x xmlns="jabber:x:data" type="submit">
         <field var="FORM_TYPE" type="hidden">
            <value>urn:xmpp:mam:0</value>
         </field>
         <field var="start">
            <value>2015-10-18T14:37:52.860+00:00</value>
         </field>
      </x>
   </query>
</iq>