date from datetimepicker tag is coming null

[linuspec]

<s:form action="Insert_ Record_Rbt_in_D ataBase">

<s:hidden value="%{tableN ame}" name="tableName "></s:hidden>

<s:textfield name="PLAN_NAME " label="planName "></s:textfield>
<s:textfield name="PLAN_CODE " label="planCode "></s:textfield>

<s:select name="PLAN_TYPE " label="planType " list="{1,2,3,4, 5,6,7,8,9}" value="PLAN_TYP E" />

<s:select name="CIRCLE_ID " label="circleId " list="circle_id _list" value="circle_i d_list" ></s:select>

<s:select name="INTERFACE " label="interfac e" list="{'C','X', 'J','I'}" value="PLAN_TYP E" />

<s:textfield name="VALIDITY" label="validity "></s:textfield>
<s:textfield name="PRICE" label="price"></s:textfield>
<s:textfield name="CONTENT_T YPE" label="contentT ype" ></s:textfield>

<s:datetimepick er name="START_TIM E" id="date1" label="start time" displayFormat=" yyyy-MM-dd" > </s:datetimepicke r>
<s:datetimepick er name="END_TIME" id="date2" label="end time" displayFormat=" yyyy-MM-dd" > </s:datetimepicke r>

<s:select name="STATUS" label="status" list="{1,2,3,4} " ></s:select>
<s:select name="CHARGING_ STATUS" label="charging Status" list="{1,2,3,4} "></s:select>

<s:textfield name="USER_DEF1 " label="userDef1 "></s:textfield>
<s:textfield name="SERVICE_I D" label="serviceI d"></s:textfield>
<s:textfield name="SERVICE_T YPE" label="serviceT ype"></s:textfield>

<s:select name="SUBSCRIBE R_TYPE" label="subscrib erId" list="{'P','C'} "></s:select>

<s:textfield name="max_corp_ user" label="max_corp _user"></s:textfield>

<s:submit type="button" name="InsertRec ord" value="InsertRe cord"></s:submit>
</s:form>