checkDate.js

function checkDate(date) {
   "use strict";
   if (/\d{4}-\d{2}-\d{2}/.test(date)) {
       var _date = new Date(date).toString();

       if (_date === "NaN" || _date === "Invalid Date") {
           return "Invalid Date";
       } else {
           return true;
       }

   } else {
       return "Wrong Format";
   }