Filter criteria issue in soap query

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  I want to fetch appointment details through soap query. If i am not using filteration query is returning data, but if i am using filteration data is not showing. I am not understanding what i am doing wrong. Below is my code, appriciate if any body can help. I am using CRM2011.

    var xml = "" +
    "<?xml version=\"1.0\" encoding=\"utf-8\"?>" +
    "<soap:Envelope xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\">" +
    GenerateAuthenticationHeader() +
    "  <soap:Body>" +
    "    <RetrieveMultiple xmlns=\'http://schemas.microsoft.com/crm/2007/WebServices\'>" +
    "      <query xmlns:q1=\'http://schemas.microsoft.com/crm/2006/Query\' xsi:type=\'q1:QueryExpression\'>" +
    "        <q1:EntityName>filteredAppointment</q1:EntityName>" +
    "        <q1:ColumnSet xsi:type=\'q1:ColumnSet\'>" +
    "          <q1:Attributes>" +
    "            <q1:Attribute>activityid</q1:Attribute>" +
    "            <q1:Attribute>actualstart</q1:Attribute>" +
    "          </q1:Attributes>" +
    "        </q1:ColumnSet>" +
    "        <q1:Distinct>false</q1:Distinct>" +
   "        <q1:Criteria>" +
    "          <q1:FilterOperator>And</q1:FilterOperator>" +
    "          <q1:Conditions>" +
    "            <q1:Condition>" +
    "              <q1:AttributeName> actualstart</q1:AttributeName>" +
    "              <q1:Operator>ge</q1:Operator>" +
    "              <q1:Values>" +
    "                <q1:Value xsi:type=\"xsd:DateTime\">'2013/07/18T17:00:00 +5:30' </q1:Value>" +
    "              </q1:Values>" +
    "            </q1:Condition>" +
    "          </q1:Conditions>" +
    "        </q1:Criteria>" +
    "      </query>" +
    "    </RetrieveMultiple>" +
    "  </soap:Body>" +
    "</soap:Envelope>";
    
          var xmlHttpRequest = new ActiveXObject("Msxml2.XMLHTTP");
          xmlHttpRequest.Open("POST", "/mscrmservices/2007/CrmService.asmx", false);
          xmlHttpRequest.setRequestHeader("SOAPAction", "http://schemas.microsoft.com/crm/2007/WebServices/RetrieveMultiple");
          xmlHttpRequest.setRequestHeader("Content-Type", "text/xml; charset=utf-8");
          xmlHttpRequest.setRequestHeader("Content-Length", xml.length);
          xmlHttpRequest.send(xml);
          // retrieve response and find attribute value    
          var result = xmlHttpRequest.responseXML.selectNodes("//q1:actualstart");
          if (result == null)
              return "";
          else
              return result.text;

  Friday, July 19, 2013 2:39 PM