Run results for: DateTime

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: 10 months ago

Test name	Executions per second
Luxon	102642.0 Ops/sec
dayJs	16923.1 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/dist/date-fns.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>

<!-- 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 Preparation code:

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

Tests:

Luxon
luxon.DateTime.fromISO(isoString).setZone('Europe/Berlin').startOf('day').toISO();
dayJs
dayjs(isoString).tz('Europe/Berlin').startOf('day').format();

Luxon

dayJs