How To Add Number Days in jsp

Hi,
I want to add number of days in a date string using jsp.
<%--
    Document   : try5
    Created on : May 20, 2008, 6:00:20 PM
    Author     : thamaraiselvan
--%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <%
        String datetxt="2008-05-20";
        %>
    </body>
</html>How to add 30,90,180,365 days in that String datetxt value.
Thanks Alot....

Hi,
How to format a string value into a Date.
I typed the following code .but its gives a exception.
<%--
    Document   : try5
    Created on : May 20, 2008, 6:00:20 PM
    Author     : thamaraiselvan
--%>
<%@page contentType="text/html" pageEncoding="UTF-8" import="java.sql.*,java.util.Date,java.util.Calendar,java.text.SimpleDateFormat" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">
<html>
    <head>
        <title>JSP Page</title>
    </head>
    <body>
        <%
        try
        String datetxt="2008-05-20";
        int e=30;
       // calendar.set(Calendar.DAY,calendar.get(Calendar.DAY)+30);
       // Calendar cal = Calendar.getInstance();
        //Date today = cal.getTime();
        SimpleDateFormat fmt =new SimpleDateFormat("yyyy-MM-dd");
        String thamu = fmt.format(datetxt);
        out.println(thamu);
        catch(Exception e)
            out.println(e);
        %>
    </body>
</html>Exception Like This :
java.lang.IllegalArgumentException: Cannot format given Object as a Date .
After Formatting to date i want to add 180 days from '2008-05-20' .
Please Help me...
Thanks Alot....

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