pre-populating textfield befor form submit in struts2

Hi have a form in which I am generating list of input box dynamically, but I am having the problem when I try to use date value of date picker within the form as hidden a field within the same form.

my jsp page is given below.

<%@ taglib prefix="sj" uri="/struts-jquery-tags"%> 
 <html>
 <head>
 <sj:head jqueryui="true"/>
 </head>
 <body>
 <s:form action="attendanceForm">
 Select Date: <sj:datepicker name="today" appendText="(dd.MM.yy)" displayFormat="dd.MM.yy" yearRange="1980:2000" changeYear="true"/>
 	<table border="solid 1px">
 	<tr bgcolor="#F87431">
 	<th>Student Name</th><th></th><th>Status</th><th>Reason</th><th>Roll Number</th>
 	</tr>
 	<s:iterator value="studentList" status="userStatus">
 		<tr
 				class="<s:if test="#userStatus.odd == true ">odd</s:if><s:else>even</s:else>">
 				<td><s:property value="firstname" /><s:property value="middletname" /><s:property value="lastname" /></td>
 				<s:hidden name="AttandanceList[%{#userStatus.index}" cols="60" rows="10">.id" value="%{studentList[#userStatus.index].id}"/>
				<s:hidden name="AttandanceList[%{#userStatus.index}].today" value="%{today}" />
				<td><s:property value="id" value="%{studentList[#userStatus.index].id}" /></td>
				<td><s:textfield name="AttandanceList[%{#userStatus.index}].status" /></td>
				<td><s:textfield name="AttandanceList[%{#userStatus.index}].reason"/></td>
				<td><s:textfield name="AttandanceList[%{#userStatus.index}].reason"/></td>
			</tr>
			
		</s:iterator>
 	</table> 
 	<s:submit>Save</s:submit>
 </s:form>
</body>

</html>

I have try to search the solution for the problem but not getting any idea.