Run results for: new Date().toISOString() vs new Date().toLocaleString()

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/119.0

Browser: Firefox 119

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 2 years ago

new Date().toISOString()

3.1M/s

new Date().toLocaleString()

765K/s

View exact numbers

Test name	Executions per second
✓ new Date().toISOString()	3,100,205 Ops/sec
new Date().toLocaleString()	765,136 Ops/sec

Script Preparation code:

var timestamp = null;

Tests: