Run results for: luxon vs datefns vs moment vs day.js

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.0.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 26

Operating system: iOS 18.7

Device Platform: Mobile

Date tested: 9 months ago

datefns

1.5M/s

day.js

1.4M/s

luxon

794K/s

moment

305K/s

View exact numbers

Test name	Executions per second
✓ datefns	1,469,915 Ops/sec
day.js	1,405,340 Ops/sec
luxon	793,562 Ops/sec
moment	305,207 Ops/sec

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/luxon@1.26.0/build/global/luxon.min.js"></script>
<script src="https://igor.moomers.org/random/datefns.js"></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.22.0/moment.min.js'></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/dayjs/1.11.7/dayjs.min.js'></script>

Script Preparation code:

window.ds = "2020-02-19T00:51:53.623839+00:00";

Tests:

datefns
window.datefns.parseISO(window.ds)
luxon
luxon.DateTime.fromISO(ds);
moment
moment(ds)
day.js
dayjs(ds)