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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:151.0) Gecko/20100101 Firefox/151.0

Browser: Firefox 151

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one month ago

day.js

1.5M/s

datefns

1.5M/s

luxon

857K/s

moment

391K/s

View exact numbers

Test name	Executions per second
✓ day.js	1,548,452 Ops/sec
datefns	1,455,436 Ops/sec
luxon	857,500 Ops/sec
moment	390,659 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)