how to convert dd/mm/yy to yy/mm/dd

You click on the date and time on the bottom right of your screen.
-> Change date and Time Settings -> Again, Change date and Time Settings ->  Change calender settings -> From the drop down for Short date; Select yyyy -mm -dd . Apply and ok.

P.S: I've checked these settings from Windows 7. Some options may differ in other operating systems.

<script language="JavaScript">
<!--
strDate= '09/02/10';
var strNewDate = strDate.substring(6,10) + '/' + strDate.substring(3,5) + '/' + strDate.substring(0,2); 
alert(strNewDate);

//-->
</script>

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Here's the implementation. By the way, this works even if the date is without leading zeroes, i.e.: 1/1/10

<script type="text/javascript">
function convertDate(string) {
   var date = string.split('/');
   return date[2] + "/" + date[1] + "/" + date[0];
}
alert( convertDate("08/11/10") );
</script>

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Thanks for the points!