A simple benchmark of a simple date format

index.js

var Benchmark = require('benchmark');
var moment = require('moment');
var faker = require('faker');
var suite = new Benchmark.Suite;
var format = 'YYYY-MM-DD';
var dateArr = [];
var pad = "00";

for (let i = 0; i < 100000; i++) {
  dateArr[i] = moment(faker.date.past()).format();
}

// add tests
suite
.add('moment#format', function() {
  var arr = [];
  var len = dateArr.length;
  for (let i = 0; i < len; i++) {
    arr[i] = moment.utc(dateArr[i]).format(format);
  }
})
.add('moment manual', function() {
  var arr = [];
  var len = dateArr.length;
  var mom;
  for (let i = 0; i < len; i++) {
    mom = moment.utc(dateArr[i]);
    arr[i] = mom.year() + '-' + (pad + (mom.month() + 1)).slice(-pad.length) + '-' + (pad + mom.date()).slice(-pad.length);
  }
})
.add('moment manual + padStart', function() {
  var arr = [];
  var len = dateArr.length;
  var mom;
  for (let i = 0; i < len; i++) {
    mom = moment.utc(dateArr[i]);
    arr[i] = mom.year() + '-' + ('' + (mom.month() + 1)).padStart(2, '0') + '-' + ('' + mom.date()).padStart(2, '0');
  }
})
.add('Date manual', function() {
  var arr = [];
  var len = dateArr.length;
  var dt;
  for (let i = 0; i < len; i++) {
    dt = new Date(dateArr[i]);
    arr[i] = dt.getFullYear() + '-' + (pad + (dt.getMonth() + 1)).slice(-pad.length) + '-' + (pad + dt.getDate()).slice(-pad.length);
  }
})
.add('Date manual + padStart', function() {
  var arr = [];
  var len = dateArr.length;
  var dt;
  for (let i = 0; i < len; i++) {
    dt = new Date(dateArr[i]);
    arr[i] = dt.getFullYear() + '-' + ('' + (dt.getMonth() + 1)).padStart(2, '0') + '-' + ('' + dt.getDate()).padStart(2, '0');
  }
})
.add('Date split', function() {
  var arr = [];
  var len = dateArr.length;
  var dt;
  for (let i = 0; i < len; i++) {
    dt = new Date(dateArr[i]);
    arr[i] = dt.toISOString().split('T')[0];
  }
})
// add listeners
.on('cycle', function(event) {
  console.log(String(event.target));
})
.on('complete', function() {
  console.log('Fastest is ' + this.filter('fastest').map('name'));
})
// run
.run();

package.json

{
  "name": "benchmark-date-format",
  "version": "1.0.0",
  "description": "A simple benchmark of a simple date format",
  "main": "index.js",
  "dependencies": {
    "benchmark": "^2.1.4",
    "faker": "^4.1.0",
    "microtime": "^2.1.6",
    "moment": "^2.18.1"
  },
  "devDependencies": {},
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "Colin Kennedy <moshen.colin@gmail.com>",
  "license": "MIT"
}