import java.text.FieldPosition;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

/**
* Code to illustrate adding a DAY and setting fixed hour
* and minute.
*
* @author Sai Matam (saimatam at yahoo dot com )
*
*/

public class NextDay4Main
{
    public static SimpleDateFormat
          sdf = new SimpleDateFormat("MM/dd/yy HH:mm:ss");

    public static void main(String[] args)
    {
        GregorianCalendar cal = new GregorianCalendar();
        cal.setTime(new Date());
        System.out.println(" Current date is: " + formatDate(cal.getTime()));
        cal.add(Calendar.DAY_OF_YEAR, 1);
        cal.set(Calendar.HOUR_OF_DAY, 4);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        System.out.println("Required date is: " + formatDate(cal.getTime()));
    }

    public static String formatDate(Date inDate)
    {
        StringBuffer buf = new StringBuffer(1024);
        sdf.format(inDate, buf, new FieldPosition(0) );
        return buf.toString();
    }
}

What you want to do is to get the current date, roll the day over to the
next day and then set the timestamp to your time.  Something like this:

public class Anon1 {
static SimpleDateFormat sdf = new SimpleDateFormat ("MM-dd-yyyy
HH:mm:ss.SSSS");

public static final void main (String [] args) {
 Calendar cal = GregorianCalendar.getInstance ();
 System.out.println(sdf.format(cal.getTime()));

 cal.add(Calendar.DATE, 1);

 cal.set(Calendar.HOUR_OF_DAY, 4);
 cal.set(Calendar.MINUTE, 30);
 cal.set(Calendar.SECOND, 0);
 cal.set(Calendar.MILLISECOND,0);

 System.out.println (sdf.format(cal.getTime()));
}
}

Cheers,
Matt Humphrey matth@ivizNOSPAM.com http://www.iviz.com/