Run results for: new Date vs custom method

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; SM-J400F) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 111

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
new Date	68274.1 Ops/sec
custom method	97233.8 Ops/sec

Script Preparation code:

var seconds = 3601;

Tests:

new Date
new Date(seconds * 1000).toISOString().slice(seconds >= 3600 ? 11 : 14, 19);
custom method
const hh = Math.floor(seconds / 3600); seconds %= 3600; let mm = Math.floor(seconds / 60); let ss = Math.floor(seconds % 60); if (mm < 10) mm = `0${mm}`; if (ss < 10) ss = `0${ss}`; return hh > 0 ? `${hh}:${mm}:${ss}` : `${mm}:${ss}`;