Determine if a string is a validate Date

Date.valid.js

Date.valid = function(str){
  var d = new Date(str);
  return (Object.prototype.toString.call(d) === "[object Date]" && !isNaN(d.getTime()));
}

Date.valid.min.js

Date.valid=function(a){var b=new Date(a);return"[object Date]"===Object.prototype.toString.call(b)&&!isNaN(b.getTime())};