How can I validate that someone is over 18 from their date of birth?

Question

I am doing validation for Driver\'s Date of birth, it should be minimum of 18 from the current date.

var Dates = $get(\'<%=ui_txtDOB.ClientID %>\');            


        

Answer 1

After looking at various methods of doing this, I decided the simplest way was to encode the dates as 8-digit integers. You can then subtract today's code from the DOB code and check if it's greater than or equal to 180000.

function isOverEighteen(year, month, day) {
  var now = parseInt(new Date().toISOString().slice(0, 10).replace(/-/g, ''));
  var dob = year * 10000 + month * 100 + day * 1; // Coerces strings to integers

  return now - dob > 180000;
}