Run results for: DateTime Timezone Test

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0

Browser: Firefox 140

Operating system: Ubuntu

Device Platform: Desktop

Date tested: one year ago

Moment

58K/s

Luxon

37K/s

Temporal timeozne

30K/s

dayJs

6K/s

View exact numbers

Test name	Executions per second
✓ Moment	57,589 Ops/sec
Luxon	36,828 Ops/sec
Temporal timeozne	29,609 Ops/sec
dayJs	6,264 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>

<!-- 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
luxon.DateTime.fromISO(isoString).setZone('Europe/Berlin').startOf('day').toISO();
dayJs
dayjs(isoString).tz('Europe/Berlin').startOf('day').format();
Moment
moment.tz(isoString, 'Europe/Berlin').startOf('day').format();
Temporal timeozne
Temporal.Instant.from(isoString) .toZonedDateTimeISO('Europe/Berlin') .with({ hour: 0, minute: 0, second: 0, millisecond: 0 }).toString();