Birthday Calculation (v3)

Revision 3 of this benchmark created on

Setup

var dateString = "1992-01-13";

Test runner

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Testing in
TestOps/sec
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
Optimized & Precise
calcAge(dateString);

function calcAge(dateString) {
  // 1.0 / (24 * 3600 * 365.242 * 1000)
  return (Date.now() - new Date(dateString)) * 3.1688781887280417022341554569502e-11;
}
ready

Revisions

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