Run results for: Timezone format: Intl.DateTimeFormat vs. Moment.js vs. Luxon

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Luxon

41K/s

Native

7K/s

View exact numbers

Test name	Executions per second
✓ Luxon	41,210 Ops/sec
Native	7,368 Ops/sec

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/luxon/3.3.0/luxon.min.js" integrity="sha512-KKbQg5o92MwtJKR9sfm/HkREzfyzNMiKPIQ7i7SZOxwEdiNCm4Svayn2DBq7MKEdrqPJUOSIpy1v6PpFlCQ0YA==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>

Script Preparation code:

window._date = new Date();
window._now = _date.getTime();
window._iso = _date.toISOString();

Tests:

Native
const dateTimeFormat = new Intl.DateTimeFormat("en-GB", { timeZone: "Europe/Prague", timeZoneName: "longOffset", year: "numeric", month: "2-digit", day: "2-digit", hour: "2-digit", minute: "2-digit", second: "2-digit", }).formatToParts(_now); var dt = {}; dateTimeFormat.forEach((arrayPart) => { if (arrayPart.type !== "literal") { dt[arrayPart.type] = arrayPart.value; } }); var date = `${dt.year}-${dt.month}-${dt.day}T${dt.hour}:${dt.minute}:${dt.second}${dt.timeZoneName.slice(3)}`; console.assert(date === _iso);
Luxon
var date = luxon.DateTime.now().setZone('Europe/Prague').toISO(); console.assert(date === _iso);