Check date is valid or not in JavaScript

Find a function to check date is valid or not in Java script

                        /**
                        * Get the number of days in any particular month                       
                        * @param  {integer} m The month (valid: 0-11)
                        * @param  {integer} y The year
                        * @return {integer}   The number of days in the month
                        */
                        var daysInMonth = function (m, y) {
                            switch (m) {
                                case 1:
                                    return (y % 4 == 0 && y % 100) || y % 400 == 0 ? 29 : 28;
                                case 8: case 3: case 5: case 10:
                                    return 30;
                                default:
                                    return 31
                            }
                        };

                        /**
                        * Check if a date is valid                       
                        * @param  {[type]}  d The day
                        * @param  {[type]}  m The month
                        * @param  {[type]}  y The year
                        * @return {Boolean}   Returns true if valid
                        */
                        var isValidDate = function (d, m, y) {                           
                            m = parseInt(m, 10) - 1;
                            return m >= 0 && m < 12 && d > 0 && d <= daysInMonth(m, y);
                        }; 

Calling From Function:-

var bits = tempVal.split('/');
alert(isValidDate(bits[0], bits[1], bits[2]));

Example:-

isValidDate(30, 3, 2013); // March 30, 2013 - true
isValidDate(29, 2, 2013); // February 29, 2013 - false
isValidDate(29, 2, 2012); // February 29, 2012 - true