Javascript Date Validation ( DD/MM/YYYY) & Age Checking

Question

I\'ve started to work on Javascript recently. What I am testing is checking the DoB in valid format. Next step will be checking the age.

What my HTML code includes

Answer 1

When we put only pattern it's not simple to check every possible date combination. Users can enter valid numbers like 99/99/9999 but it's not a valid date. Even If we limit days and months to a more restrictive value (30/31 days and 0-12 months) we still may get a case where we have leap year, febraury etc. and we cannot properly validate them using regex. So the better approach is to use a date object itself.

let InputDate = "99/99/9999"
let pattern =/^([0-9]{2})\/([0-9]{2})\/([0-9]{4})$/;
let editDate = InputDate.replace("\/","-")

let dateValidation = function validation(){
  
if(pattern.test(InputDate) && new Date(editDate) == 'Invalid Date'){
  return false;
}else{
  return true;
}

}

console.log(dateValidation()) //Return false