Date field validation

[msdnexpert]

Dear all,
I am entering date data into a text input. I would like to validate the date entered. The date can be in the following formats.
dd/mm/yyyy
dd/mmm/yyyy
How does one do this validation through Javascript.
Code snippets for date validation would help a lot.
Thanks in advance.

this one forces date format: mm/dd/yyyy:

function isValidDate(myDate) {
   var datefmt = /(^\d{1,2})[\/]{1,1}(\d{1,2})[\/]{1,1}(\d{4,4}$)/;
   var result = myDate.match(datefmt);

   if ( result != null ) {
      var month = result[1]; 
      var date  = result[2]; 
      var year  = result[3];
      var test = new Date(year,month-1,date);
      //alert("result="+result);

      if (year == test.getFullYear() && (month-1 == test.getMonth()) && (date == test.getDate()))
        return true;
      else 
         return false;
   }
   else 
      return false;
}

[msdnexpert]

Thanks fella. Thank you very much.