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I tested this out and it works:

ZUL

<?page title="new page title" contentType="text/html;charset=UTF-8"?>
<zk>
<window title="new page title" border="normal" 
        apply="org.zkoss.bind.BindComposer"
        viewModel="@id('vm') @init('TestViewModel')">

     <datebox id="myDate" constraint="@bind(vm.myDateConstraint)"  
                  value="@bind(vm.myDate)" />
</window>
</zk>

TestViewModel

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

import org.zkoss.zul.SimpleDateConstraint;

public class TestViewModel 
{
    private static final SimpleDateFormat SDF = new SimpleDateFormat("dd-MM-yyyy");

    private SimpleDateConstraint sdc;
    private Date constraintDate;
    private Date myDate;

    public Date getMyDate()
    {
        if (myDate == null)
        {
            myDate = new GregorianCalendar().getTime();
        }

        return myDate;
    }
    public void setMyDate(Date myDate)
    {
        this.myDate = myDate;
    }

        public SimpleDateConstraint getMyDateConstraint() 
        {
               constraintDate = new GregorianCalendar(2012, 10, 30).getTime();

               sdc = new SimpleDateConstraint("before 20121130: " + 
                                              "Error! Date " + SDF.format(getMyDate()) + 
                                              " is before " + SDF.format(constraintDate));

               return sdc;
        }

    public void setMyDateConstraint(SimpleDateConstraint sdc)
    {
        this.sdc = sdc;
    }
}