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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:133.0) Gecko/20100101 Firefox/133.0

Browser: Firefox 133

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

date-fns

3.8M/s

Dayjs

847K/s

js-joda

99K/s

luxon

78K/s

View exact numbers

Test name	Executions per second
✓ date-fns	3,771,347 Ops/sec
Dayjs	846,558 Ops/sec
js-joda	98,895 Ops/sec
luxon	77,976 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/dayjs@1/plugin/customParseFormat.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:

dayjs.extend(window.dayjs_plugin_customParseFormat);

Tests:

Dayjs
dayjs('23/9/1 0:0:0', 'YY/M/D H:m:s');
luxon
luxon.DateTime.fromFormat('23/9/1 0:0:0', 'yy/M/d H:m:s');
js-joda
JSJoda.LocalDateTime.parse('23/9/1 0:0:0', JSJoda.DateTimeFormatter.ofPattern('yy/M/d H:m:s'));
date-fns
dateFns.parse('23/9/1 0:0:0', 'yy/M/d H:m:s', new Date())