Run results for: js-joda vs date-fns vs new Date() from ISO strings

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.0.1 Safari/605.1.15

Browser: Safari 26

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 6 months ago

Test name	Executions per second
js-joda (ZonedDateTime)	111537.7 Ops/sec
date-fns	2278514.0 Ops/sec
new Date()	66338152.0 Ops/sec
js-joda (just a date)	196076.8 Ops/sec

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/@js-joda/core@5.6.3/dist/js-joda.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/date-fns/1.9.0/date_fns.min.js"></script>

Tests:

js-joda (ZonedDateTime)
JSJoda.ZonedDateTime.parse('2025-01-09T12:36:53Z');
date-fns
dateFns.parse('2025-01-09T12:36:53Z')
new Date()
new Date('2025-01-09T12:36:53Z')
js-joda (just a date)
JSJoda.LocalDate.parse('2025-01-09')

Run results for: js-joda vs date-fns vs new Date() from ISO strings

js-joda (ZonedDateTime)

date-fns

new Date()

js-joda (just a date)