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/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36 Edg/137.0.0.0

Browser: Chrome 137

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

new Date()

11.3M/s

date-fns

2.2M/s

js-joda (just a date)

856K/s

js-joda (ZonedDateTime)

389K/s

View exact numbers

Test name	Executions per second
✓ new Date()	11,332,824 Ops/sec
date-fns	2,217,141 Ops/sec
js-joda (just a date)	855,817 Ops/sec
js-joda (ZonedDateTime)	388,693 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')