Invalid field value for field- Date

[Chandana Garlapati]

Hi,
I am getting the Invalid field value for field Date error

my JSP file

<s:datetimepicker name="todayDate" label="Format(dd-MMM-yyyy)"
			displayFormat="dd-MMM-yyyy" /> 

validation.xml

<field name="todayDate">
		<field-validator type="datetime">
			<param name="min">1990</param>  
            <param name="max">2020</param>  
			<message><![CDATA[ must be a min 01-01-1990 max 01-01-2020 if supplied ]]></message>
		</field-validator>
	</field>

can anyone please help me.

Thanks in advance.