Struts validation for combine form fields validation

[Sumith Mathur]

I'm using dynaForm and validation plug-in, I trying to figure out how
can I do a date validation if on the form I've date as 3 different
form fields for Month, Day and Year.
Is there a way, I can declare in the validation.xml to combine Month,
Day and Year fields and validate for validDate.

Thanks

Sumith

-----------------------------------
<!-- validation.xml -->

<form name="userProfileForm">

<field property="firstName"
depends="required,maxlength">
<arg0 key="user.firstName" />
<arg1 key="${var:maxlength}" name="maxlength"
resource="false" />
<var>
<var-name>maxlength</var-name>
<var-value>14</var-value>
</var>

</field>
<field property="lastName"
depends="required,maxlenght">
<arg0 key="user.lastName" />
<arg1 key="${var.maxlenght}" name="maxlength"
resource="false" />
<var>
<var-name>maxlenght</var-name>
<var-value>20</var-value>
</var>
</field>
<field property="middleName" depends="required">
<arg0 key="user.middleName" />
</field>
<field property="dateOfBirthMonth" depends="required">
<arg0 key="user.dOBMonth" />
</field>
<field property="dateOfBirthDay" depends="required">
<arg0 key="user.dOBDay" />
</field>
<field property="dateOfBirthYear" depends="required">
<arg0 key="user.dOBYear
</field>

----------------------------------------------------
<!--struts-config.xml-->
<form-beans>
<form-bean name="userProfileForm"
type="org.apache.struts.validator.DynaValidatorForm" >
<form-property type="java.lang.String" name="firstName"/>
<form-property type="java.lang.String" name="middleName"/>
<form-property type="java.lang.String"
name="dateOfBirthMonth"/>
<form-property type="java.lang.String" name="dateOfBirthDay"/>
<form-property type="java.lang.String" name="dateOfBirthYear"/>
</form-bean>
</form-beans>