Validate users birthdate to be at least 18 years old

birthdateValidate.js

/*--------------------------------------------------------------------------
VALIDATE BIRTH DATE TO BE ATLEAST 18 YEARS OLD
--------------------------------------------------------------------------*/

function validateBirthDate() {

  // date formmat  day/month/year  = 23/02/2001

  var dateValue = $('#customer_birth_date').val();
  var dateInput = $('#customer_birth_date');

  var match = /(\d+)\/(\d+)\/(\d+)/.exec(dateValue);


  if (match) {

    var day = Number(match[1]);
    var month = Number(match[2]);
    var year = Number(match[3]);

    // Check if over 18.

    var date = new Date();
    date.setFullYear(year, month - 1, day);

    var eighteenYears = new Date();
    eighteenYears.setFullYear(eighteenYears.getFullYear() - 18);

    if (date > eighteenYears) {
      console.log("under 18 years old");
    
      // under 18.
    }
    else {
      console.log('18 years old');
      
      // 18 or older
    }
  }


}