Run results for: new Intl.DateTimeFormat vs cached Intl.DateTimeFormat vs date method

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser: Chrome 128

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

cached Intl.DateTimeFormat.formatToParts()

366K/s

cached Intl.DateTimeFormat.format()

252K/s

date methods

22K/s

new Intl.DateTimeFormat.formatToParts

19K/s

new Intl.DateTimeFormat.format()

18K/s

View exact numbers

Test name	Executions per second
✓ cached Intl.DateTimeFormat.formatToParts()	365,698 Ops/sec
cached Intl.DateTimeFormat.format()	251,514 Ops/sec
date methods	21,628 Ops/sec
new Intl.DateTimeFormat.formatToParts	19,092 Ops/sec
new Intl.DateTimeFormat.format()	18,037 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: