How to remove time portion of date using javascript?

[BobbyRachel]

i have a javascript variable which holds date time value... i need only date from it...

<script type="text/javascript">    function update(){    var datefield = document.getElementById("myTextBox_CWPWORKLIST.DUE_DATE").value;    alert(datefield);    }    </script>

here the datefield = 2013-02-21 00:00:00.0... i need datefield = 2013-02-21.. how to get this..

[BobbyRachel]

i got the answer....

  <script type="text/javascript">    function update(){    var datefield = document.getElementById("myTextBox_CWPWORKLIST.DUE_DATE").value;    alert(datefield);var columnname = dateFormat(datefield, "dd-mm-yy");alert(columnname);    }    </script>