RegEx to validate date

Regular expression used to validate a date.

HTML

<input type="text" id="date" name="date" value="dd/mm/yyyy" />
<button onclick="isDate();">Check</button>

JavaScript

function isDate() {
     
         var txt = document.getElementById("date").value; 
         var regEx = /^\d{4}-\d{2}-\d{2}$/;
  
         if(txt.match(regEx)){
         
         alert("Please enter date format mm/dd/yyyy");
         
         }else{
         
          alert("Thanks..You have entered correct date");
         
         }
    
}