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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36

Browser: Chrome 119

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Dayjs	89183.9 Ops/sec
luxon	272679.0 Ops/sec
js-joda	3598214.2 Ops/sec
date-fns	926049.4 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 dayjsDate1 = dayjs('2022-09-01T00:00:00+09:00');
var dayjsDate2 = dayjs('2023-09-01T00:00:00+09:00');
var luxonDate1 = luxon.DateTime.fromISO("2022-09-01T00:00:00+09:00");
var luxonDate2 = luxon.DateTime.fromISO("2023-09-01T00:00:00+09:00");
var jsJodaDate1 = JSJoda.ZonedDateTime.parse('2022-09-01T00:00:00+09:00', JSJoda.DateTimeFormatter.ISO_OFFSET_DATE_TIME);
var jsJodaDate2 = JSJoda.ZonedDateTime.parse('2023-09-01T00:00:00+09:00', JSJoda.DateTimeFormatter.ISO_OFFSET_DATE_TIME);
var date1 = new Date('2022-09-01T00:00:00+09:00');
var date2 = new Date('2023-09-01T00:00:00+09:00');

Tests:

Dayjs
dayjsDate2.diff(dayjsDate1, 'month');
luxon
luxonDate2.diff(luxonDate1, 'months');
js-joda
jsJodaDate1.until(jsJodaDate2, JSJoda.ChronoUnit.MONTHS);
date-fns
dateFns.differenceInMonths(date2, date1);

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

Dayjs

luxon

js-joda

date-fns