<%@ page import="java.util.*,java.text.*,java.net.*" %>
<html>

<head><title>Calendar</title></head>

<body bgcolor="white">

<font size=3>

<%


    Calendar calendar;

    Calendar today = new GregorianCalendar();
    int dayOfWeek;

    int lastDayOfMonth;

    Date date;

    SimpleDateFormat sdf;



    String action = request.getParameter("action");
    if (action == null || action.equals(""))
    {


        calendar = new GregorianCalendar();
    }

    else

    {
        action = URLDecoder.decode(action);
        calendar = (Calendar)session.getAttribute("calendar");
        calendar.set(Calendar.DATE, 1);

        if (action.equals("<<"))
        {
            calendar.add(Calendar.MONTH, -1);
        }
        else // action.equals(">>")
        {
            calendar.add(Calendar.MONTH, 1);
        }


    }



    session.setAttribute("calendar", calendar);
    lastDayOfMonth = calendar.getActualMaximum(Calendar.DATE);
%>

<center>

<form method=POST action=Calendar.jsp>

<table>

<tr>

<th align=right><input type=submit name=action value="<<">
<%


    date = calendar.getTime();

    sdf = new SimpleDateFormat("MMM yyyy");
%>

<th><%= sdf.format(date) %>

<th align=left><input type=submit name=action value=">>">
</table>

</form>

<form method=POST action=Caller.jsp>

<table border=1>

<tr align=center>

<th><font color="red">Su</font>

<th>Mo

<th>Tu

<th>We

<th>Th

<th>Fr

<th><font color="red">Sa</font>

<tr align=center>

<%


    calendar.set(Calendar.DATE, 1);

    dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);



    // display initial blank spaces

    for (int blank=Calendar.SUNDAY; blank<dayOfWeek; blank++)
    {

%>

<td>&nbsp;

<%


    }



    sdf = new SimpleDateFormat("dd");



    // display days of the current month
    for (int day=1; day<=lastDayOfMonth; day++)
    {
        calendar.set(Calendar.DATE, day);
        dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
        date = calendar.getTime();

        if ((today.get(Calendar.YEAR) == calendar.get(Calendar.YEAR))
            && (today.get(Calendar.MONTH) == calendar.get(Calendar.MONTH))
            && (today.get(Calendar.DATE) == calendar.get(Calendar.DATE)))
        {
            // this only works in Linux but not in Windows platform


%>

<td><b><font color="blue"><input type=submit name=day value=<%= sdf.format(date) %>></font></b>
<%
        }
        else if ((calendar.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY) ||
            (calendar.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY))
        {
            // this only works in Linux but not in Windows platform


%>

<td><font color="red"><input type=submit name=day value=<%= sdf.format(date) %>></font>
<%
        }
        else
        {


%>

<td><input type=submit name=day value=<%= sdf.format(date) %>>
<%


        }

        // begins a new row after every Saturday
        if (calendar.get(Calendar.DAY_OF_WEEK) % 7 == 0)
        {


%>

<tr align=center>

<%


        }

    }



    // display final blank spaces

    for (int blank=dayOfWeek+1; blank<=Calendar.SATURDAY; blank++)
    {

%>

<td>&nbsp;

<%


    }



    sdf = new SimpleDateFormat("yyyy");
%>

<input type=hidden name=year value=<%= sdf.format(date) %>>
<%


    sdf = new SimpleDateFormat("MM");

%>

<input type=hidden name=month value=<%= sdf.format(date) %>>
</table>

</form>

</center>

</font>

</body>

</html>