Birthday Calculation (v4)

Revision 4 of this benchmark created on

Setup

var dateString = "1992-01-13";

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Testing in
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Accepted Answer
getAge(dateString);

function getAge(dateString) {
  var today = new Date();
  var birthDate = new Date(dateString);
  var age = today.getFullYear() - birthDate.getFullYear();
  var m = today.getMonth() - birthDate.getMonth();
  if (m < 0 || (m === 0 && today.getDate() < birthDate.getDate())) {
    age--;
  }
  return age;
}
ready
Optimized code
calcAge(dateString);

function calcAge(dateString) {
  var birthday = +new Date(dateString);
  return~~ ((Date.now() - birthday) / (31557600000));
}
ready
test 2
getAge(dateString);

function getAge(bday) {
  var birthdate = new Date(bday);
  var cur = new Date();
  var diff = cur - birthdate;
  var age = Math.floor(diff / 31536000000);
  return age;
}
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Revisions

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