Birthday Calculation

JavaScript performance comparison

Test case created by Kristoffer Dorph

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var dateString = "1992-01-13";
};
</script>

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Testing in unknown unknown
Test Ops/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;
}
pending…
Optimized code
calcAge(dateString);

function calcAge(dateString) {
  var birthday = +new Date(dateString);
  return ~~((Date.now() - birthday) / (31557600000));
}
pending…

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