Run results for: Date.toLocaleDateString vs dayjs vs luxon vs custom

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser: Chrome 129

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

custom

1.9M/s

dayjs

287K/s

Date.toLocaleDateString

14K/s

luxon

6K/s

View exact numbers

Test name	Executions per second
✓ custom	1,908,832 Ops/sec
dayjs	287,195 Ops/sec
Date.toLocaleDateString	13,944 Ops/sec
luxon	6,368 Ops/sec

HTML Preparation code:

<script src=" https://cdn.jsdelivr.net/npm/dayjs@1.11.10/dayjs.min.js "></script>
<script src="https://cdn.jsdelivr.net/npm/dayjs@1.11.10/locale/ru.js"></script>
<script src=" https://cdn.jsdelivr.net/npm/luxon@3.4.4/build/global/luxon.min.js "></script>

Script Preparation code:

var DATE_STR = "2024-01-01T01:01:01.001Z";

var MONTH_NAMES = [
  "января",
  "февраля",
  "марта",
  "апреля",
  "мая",
  "июня",
  "июля",
  "августа",
  "сентября",
  "октября",
  "ноября",
  "декабря"
];

function formatDateRead(date) {
  return `${date.getDate().toString()} ${MONTH_NAMES[date.getMonth()]} ${date.getFullYear()}`;
}

Tests:

Date.toLocaleDateString
new Date(DATE_STR).toLocaleDateString('ru-RU', { day: 'numeric', month: 'long', year: 'numeric', }).slice(0, -3);
luxon
luxon.DateTime.fromISO(DATE_STR).setLocale("ru").toFormat('d MMMM yyyy');
dayjs
dayjs(DATE_STR).locale('ru').format('D MMMM YYYY');
custom
formatDateRead(new Date(DATE_STR));