Date format dd/mm/yyyy in javascript

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Javascript

PHP

Hi,
I have a form and there is a text box and i want to put validation on that as dd/mm/yyyy and date must start from 2012 like 12/10/2012

please suggest

var chkdate = document.getElementById("date_slot").value
    if(document.getElementById("date_slot").value == "")
    {
        alert("Please enter the Date..!!")
        hh.date_slot.focus();
        return false;
    }
  else if(!chkdate.match(/^(0[1-9]|[12][0-9]|3[01])[\- \/.](?:(0[1-9]|1[012])[\- \/.](19|20)[0-9]{2})$/))
        {
          alert('date format is wrong');
          hh.date_slot.focus();
        return false;
        }

form

<tr>
               <td >Date For Demo :<span class="required" style="color:#64a34f;">*</span> </td>
               <td > <input id="date_slot" name="date" type="text" style="width:150px;"/> (DD/MM/YY)
               </td>
 </tr>

can you please check it and send me the detail code after edit.

Thanks