Run results for: new Intl.DateTimeFormat vs new Date().toLocaleDateString() correct 2

Run details:

User agent: Mozilla/5.0 (Android 15; Mobile; rv:132.0) Gecko/132.0 Firefox/132.0

Browser: Firefox Mobile 132

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Intl.DateTimeFormat()

3K/s

Date().toLocaleString()

109/s

View exact numbers

Test name	Executions per second
✓ Intl.DateTimeFormat()	2,637 Ops/sec
Date().toLocaleString()	109 Ops/sec

Script Preparation code:

var options = {
  year: 'numeric', month: 'numeric', day: 'numeric',
  hour: 'numeric', minute: 'numeric', second: 'numeric',
  hour12: false,
  fractionalSecondDigits: 3,
}

Tests:

Intl.DateTimeFormat()
var formatter = new Intl.DateTimeFormat('en-US', options); var date = new Date(); for(var i = 0; i < 100; i++){ formatter.format(date); }
Date().toLocaleString()
var date = new Date(); for(var i = 0; i < 100; i++){ date.toLocaleString("en-US", options) }