Run results for: Seconds to HH:MM:SS - 'Date.toISOString()' vs 'Date.setSeconds().toISOString()' vs 'Math.floor()'

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.99 Safari/537.36

Browser: Chrome 93

Operating system: Windows 7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Date().toISOString()	468974.3 Ops/sec
Date.setSeconds().toISOString()	383152.1 Ops/sec
Math.floor	556249.3 Ops/sec

Script Preparation code:

var VideoDuration = 3235.261

Tests:

Date().toISOString()
return new Date(VideoDuration * 1000).toISOString().slice(11, 19)
Date.setSeconds().toISOString()
var date = new Date(null) date.setSeconds(VideoDuration) return date.toISOString().slice(11, 19)
Math.floor
var h = Math.floor(VideoDuration / 3600) var m = Math.floor(VideoDuration % 3600 / 60) var s = Math.floor(VideoDuration % 3600 % 60) h = h ? String(h).padStart(2,0) : '00' m = m ? String(m).padStart(2,0) : '00' s = s ? String(s).padStart(2,0) : '00' return `${h}:${m}:${s}`