Format Date from String in javascript

var startDate = "March-09-2010"; 
var convertedStartDate = new Date(startDate.replace(/-/g, "/")); // replace hyphen with slash
var month = convertedStartDate.getMonth() + 1 
var date = convertedStartDate.getDate(); 
var year = convertedStartDate.getFullYear(); 
var shortStartDate = date + "-" + month + "-" + year; 
alert(shortStartDate);

demo: http://jsfiddle.net/BjnBW/

Try this:

var dt=Date.parse(Yourstring);

formatDate('DD-MM-YY',dt);

Please check this Date.parse

Check your syntax changed your code a little, modify it according to it then ---

var startDate = "March/09/2010";
var convertedStartDate = new Date(startDate);
var month = convertedStartDate.getMonth() + 1
var day = convertedStartDate.getDate();
var year = convertedStartDate.getFullYear();
var shortStartDate = day+ "-" + month+ "-" + year;
alert(shortStartDate);

your date string is not in the correct format. for correct formats, please see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Date

try this or jsfiddle

var startDate = "March-09-2010";
var tmp = startDate.split('-');
tmp.splice(1, 0, ',');
var convertedStartDate = new Date(tmp.join(' '));
var month = convertedStartDate.getMonth() + 1
var day = convertedStartDate.getDate();
var year = convertedStartDate.getFullYear();
var shortStartDate = ('0' + day).slice(-2) + "-" + ('0' + month).slice(-2) + "-" + year;
alert(shortStartDate);

var shortStartDate = 
  Globalize.format(Globalize.parseDate(startDate, 'MMMM-dd-yyyy'), 'dd-MM-yy');

Use some library to do the conversion, because the built-in Date.parse() is implementation-dependent. It depends on the system locale what formats it accepts.

The code above uses Globalize.js, which can handle a large number of date formats, including formats with month names in different languages (the default being English).

You'll need to convert 'March' to a number. One way is to use this Array extension to be able to retrieve a month number from a month name:

Array.prototype.enum = function(){
     var obj = {};
     for (var i=0; i<this.length; (i+=1)) {
        obj[this[i]] = i;
     }
     this.enum = obj;
     return this;
};

Now, create an Array with month names

var months = ('January,February,March,April,May,June,July,'+
             'August,September,October,November,December').split(',')
              .enum();

Now you rewrite your date:

var startDate = "March-09-2010".split(/\-/),
    month     = months.enum[startDate[0]]+1;
startDate     = [startDate[1],
                 month < 10 ? '0'+month : month,
                 startDate[2]].join('-');
//=> startDate now is: '09-03-2010'

Use getDateFromFormat() to convert string to date in javascript.

Check this link for more help: http://www.mattkruse.com/javascript/date/