AFAIK, None of which actually answer the question of the OP.

Hi Piet,

What's up with the value you calculated?  Despite Roedy's assumption
that no value from Calendar or Date could possibly be right, running
your code under 1.4.2_08 gave me the result you wanted of 6 not 5
which you reported for the number of weeks in the month.

-Paul

here is some code to generate an HTML calendar

package com.mindprod.lisa;

import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;

import com.mindprod.business.BigDate;

/**
* produces an HTML table calendar for any month
* suitable as a skeleton for a coming events schedule.
* put yyyy mm on command line.
*
* Requires BigDate from
* http://mindprod.com/products.html#BIGDATE
*
* May be freely used for any purpose but military
*
* @author Roedy Green
* @author copyright (c) 2003-2005 Roedy Green, Canadian Mind Products
* @version 1.0
*/
public class CalMaker
  {

  /**
   * Months of the year
   */
  private static final String[] monthNames = {
     "January",
     "February",
     "March",
     "April",
     "May",
     "June",
     "July",
     "August",
     "September",
     "October",
     "November",
     "December",};

  /**
   * days of the week 3 letter abbreviations in English. Index Sunday
= 0.
   */
  private static final String[] shortDayName = { "sun" , "mon",
"tue", "wed" , "thu", "fri", "sat"};

  /**
   * outputs cal.html in current directory with an HTML table for
that month.
   *
   * @param args   year month, e.g. 2003 11
   * @exception IOException
   */
  public static void main ( String[] args ) throws IOException
  {
     System.out.println("Results appear in cal.html" );

     int year = Integer.parseInt( args [0] );
     int month = Integer.parseInt( args [1] );
     PrintWriter out = new PrintWriter ( new FileWriter( "cal.html"
));
     out.println ( "<table width=\"620\" border=\"1\"
cellspacing=\"1\" bordercolor=\"#808080\" cellpadding=\"7\">" );

     // header
     out.println ( "<tr><th colspan=\"7\">Coming events for "
                   + monthNames[ month-1]
                   + " "
                   + year
                   + "</th></tr>" );

     // label days of the week
     out.println( "<tr>" );
     for ( int i=0; i<7; i++ )
        {
        out.println( "<th>"
                     + shortDayName[ i ]
                     + "</th>" );
        }
     out.println( "</tr>" );

     // dummy boxes before the month starts, possibly none.
     BigDate firstOfMonth = new BigDate ( year, month, 1 );
     int dummystarts =  firstOfMonth.getDayOfWeek();
     for ( int i=0; i<dummystarts; i++ )
        {
        if ( i== 0 )
           {
           out.println("<tr>");
           }
        out.println("<td>&nbsp;</td>");
        }

     // label days of the month
     int daysInMonth = BigDate.daysInMonth( month, year );
     for ( int day=1; day<=daysInMonth; day++ )
        {
        BigDate d = new BigDate ( year, month, day );
        if ( d.getDayOfWeek() == 0 )
           {
           out.println("<tr>");
           }
        out.println( "<td width=\"90\"><span class=\"daynumber\">"
                     + day
                     +
"</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td>");
        if ( d.getDayOfWeek() == 6 )
           {
           out.println("</tr>");
           }
        }

     // dummy boxes after the month ends, possibly none.
     BigDate lastOfMonth = new BigDate ( year, month, daysInMonth );
     int dummyStops = 6 - lastOfMonth.getDayOfWeek();
     for ( int i=0; i<dummyStops; i++ )
        {
        out.println("<td>&nbsp;</td>");
        if ( i == dummyStops-1 )
           {
           out.println("</tr>");
           }
        }

     out.println ( "</table>" );
     out.close();

  }
  }