JavaScript date format to MySQL date format

MySQL date format:
2015-04-24
To get JavaScript date format  the same as MySQL date format:
                        var today = new Date();
                        var dd = today.getDate();
                        var mm = today.getMonth()+1; //January is 0!

                        var yyyy = today.getFullYear();
                        if(dd<10){
                            dd='0'+dd
                         }
                        if(mm<10){
                          mm='0'+mm
                         }
                        var today = yyyy+'-'+mm+'-'+dd;