Date Parameter Issue in XML Report

Hi,
I have developed a custom report using xml data definition, but it returns an error when running with date parameters.
I have given the parameters like this..
----
<?xml version='1.0' encoding='windows-1252'?>
<dataTemplate name="XXX_REP" description= "XXX Report">
<properties>
<property name="xml_tag_case" value="upper"/>
</properties>
<parameters>
<parameter name="P_ORG_ID"/>
<parameter name="P_DIFFRENCE"/>
<parameter name="P_FROM_DATE" dataType="date" format="RRRR/MM/DD HH24:MI:SS"/>
<parameter name="P_TO_DATE" dataType="date" format="RRRR/MM/DD HH24:MI:SS"/>
<parameter name="P_FROM_SO"/>
<parameter name="P_TO_SO"/>