<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> 
<%
 Date date= new Date();
 Calendar cal = Calendar.getInstance();
 cal.setTime (date);
 cal.add (Calendar.DATE, 30);
 date = cal.getTime ();
%>
<c:set var="currentDate"><%=date%></c:set>
<c:out value="currentDate"/>