Date formatting benchmark

date-formatting.js

var Benchmark = require('benchmark');
var moment = require('moment');

var formatOpts = {
  year: 'numeric',
  month: 'short',
  day: '2-digit',
  weekday: 'long',
  hour: '2-digit',
  minute: '2-digit',
};

var dateStr = (new Date).toISOString();
var formatter = new Intl.DateTimeFormat(undefined, formatOpts);

var suite = new Benchmark.Suite;
suite.add('toLocaleDateString without options', function() {
  var date = new Date(dateStr);
  date.toLocaleDateString();
})
.add('toLocaleDateString with options', function() {
  var date = new Date(dateStr);
  date.toLocaleDateString(undefined, formatOpts);
})
.add('Intl.DateTimeFormat reuse', function() {
  var date = new Date(dateStr);
  formatter.format(date);
})
.add('Moment.js', function() {
  moment(dateStr).format('LLLL');
})
.on('complete', function() {
  this.forEach(function (bench) {
    console.log('%s: %d iterations', bench.name, bench.count);
  });
})
.run();