jsPerf.app is an online JavaScript performance benchmark test runner & jsperf.com mirror. It is a complete rewrite in homage to the once excellent jsperf.com now with hopefully a more modern & maintainable codebase.

jsperf.com URLs are mirrored at the same path, e.g:

https://jsperf.com/negative-modulo/2

Can be accessed at:

https://jsperf.app/negative-modulo/2

Parse date

Benchmark created on September 25, 2025

Test runner

Ready to run.

Testing in
Test		Ops/sec
Date.parse	`Date.parse("1970-01-01T00:00:00.000Z") // 0 Date.parse("1970-01-01T00:00:00+00:00") // 0`	ready
new Date	`new Date("1970-01-01T00:00:00.000Z") new Date("1970-01-01T00:00:00+00:00")`	ready

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.

Revision 1: published on September 25, 2025