Run results for: new Intl.DateTimeFormat vs cached Intl.DateTimeFormat vs custom

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36

Browser: Chrome 127

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Custom

1.1M/s

cached Intl.DateTimeFormat.format()

302K/s

cached Intl.DateTimeFormat.formatToParts()

156K/s

new Intl.DateTimeFormat.format()

11K/s

new Intl.DateTimeFormat.formatToParts

11K/s

View exact numbers

Test name	Executions per second
✓ Custom	1,130,751 Ops/sec
cached Intl.DateTimeFormat.format()	302,188 Ops/sec
cached Intl.DateTimeFormat.formatToParts()	156,027 Ops/sec
new Intl.DateTimeFormat.format()	10,663 Ops/sec
new Intl.DateTimeFormat.formatToParts	10,600 Ops/sec

Script Preparation code:

const TWO_DIGIT = '2-digit';

var options = {
      month: TWO_DIGIT,
      year: 'numeric',
      day: TWO_DIGIT,
      hour: TWO_DIGIT,
      hour12: false,
      minute: TWO_DIGIT,
      second: TWO_DIGIT,
    }

var cached = new Intl.DateTimeFormat('en-US', options);

Tests: