Run results for: DateTime Test Plain

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36

Browser: Chrome 137

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

date Js

2.3M/s

moment Plain4

1.1M/s

date-fns

992K/s

Luxon Plain

919K/s

dayjs Plain

642K/s

Temporal Plain

561K/s

View exact numbers

Test name	Executions per second
✓ date Js	2,272,005 Ops/sec
moment Plain4	1,078,790 Ops/sec
date-fns	992,338 Ops/sec
Luxon Plain	919,350 Ops/sec
dayjs Plain	642,328 Ops/sec
Temporal Plain	561,471 Ops/sec

HTML Preparation code:

<!-- Luxon v3.4.4 (Latest major version, maintained) -->
<script src="https://cdn.jsdelivr.net/npm/luxon@3.4.4/build/global/luxon.min.js"></script>

<!-- date-fns v3.6.0 (modular library, not typically used via single CDN) -->
<!-- CDN version includes all functions -->
<script src="https://cdn.jsdelivr.net/npm/date-fns@3.6.0/cdn.min.js"></script>

<!-- Moment.js v2.29.4 (Latest, still in maintenance mode) -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.4/moment.min.js"></script>

<!-- Correct: Moment.js with Timezone support -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment-timezone/0.5.43/moment-timezone-with-data.min.js"></script>

<!-- Day.js v1.11.10 (Latest) -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/dayjs/1.11.10/dayjs.min.js"></script>

<!-- Day.js UTC plugin (required for timezone support) -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/dayjs/1.11.10/plugin/utc.min.js"></script>

<!-- Day.js Timezone plugin -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/dayjs/1.11.10/plugin/timezone.min.js"></script>

<script src='https://cdn.jsdelivr.net/npm/temporal-polyfill@0.3.0/global.min.js'></script>

Script Preparation code:

const isoString = "2023-01-01T12:34:56.789Z";
  dayjs.extend(dayjs_plugin_utc);
  dayjs.extend(dayjs_plugin_timezone);

Tests:

Luxon Plain
luxon.DateTime.now().toISO();
moment Plain4
moment().format();
dayjs Plain
dayjs().format();
Temporal Plain
Temporal.Now.zonedDateTimeISO().toString();
date-fns
dateFns.formatISO(new Date())
date Js
new Date().toISOString();