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

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_1_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.1.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.1.1

Device Platform: Mobile

Date tested: one year ago

timestamp = Date.now();

38.8M/s

timestamp = new Date().toISOString();

6.4M/s

View exact numbers

Test name	Executions per second
✓ timestamp = Date.now();	38,783,464 Ops/sec
timestamp = new Date().toISOString();	6,416,780 Ops/sec

Script Preparation code:

var timestamp = null;

Tests:

timestamp = Date.now();
timestamp = Date.now();
timestamp = new Date().toISOString();
timestamp = new Date().toISOString();