Run results for: dayjs vs luxon vs js-joda vs date-fns (formatting)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

js-joda

2.1M/s

date-fns

595K/s

luxon

285K/s

Dayjs

195K/s

View exact numbers

Test name	Executions per second
✓ js-joda	2,128,080 Ops/sec
date-fns	594,998 Ops/sec
luxon	285,080 Ops/sec
Dayjs	194,684 Ops/sec

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/dayjs@1.11.9/dayjs.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/luxon@3.4.3/build/global/luxon.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/@js-joda/core@5.5.3/dist/js-joda.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/date-fns/1.9.0/date_fns.min.js"></script>

Script Preparation code:

var dayjsNow = dayjs();
var luxonNow = luxon.DateTime.now();
var jsJodaNow = JSJoda.ZonedDateTime.now();
var now = new Date();

Tests:

Dayjs
dayjsNow.format('YYYY/MM/DD HH:mm:ss');
luxon
luxonNow.toFormat('yyyy/LL/dd HH:mm:ss');
js-joda
jsJodaNow.format(JSJoda.DateTimeFormatter.ofPattern('yyyy/MM/dd H:m:s'));
date-fns
dateFns.format(now, 'yyyy/MM/dd HH:mm:ss')