Javascript Date toWrothFormat()

Date.prototype.toWrothFormat = function() {
 var dat = new Date(this.valueOf());
 var day = dat.getDate().toString();
 var month = (dat.getMonth() + 1).toString(); //Months are zero based
 var year = dat.getFullYear().toString();
 month = month.length == 1 ? '0' + month : month;
 day = day.length == 1 ? '0' + day : day;
 return day + '/' + month + '/' + year;
}