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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser: Chrome 134

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

cached Intl.DateTimeFormat.format()

860K/s

cached Intl.DateTimeFormat.formatToParts()

371K/s

new Intl.DateTimeFormat.formatToParts

29K/s

new Intl.DateTimeFormat.format()

28K/s

date methods

28K/s

View exact numbers

Test name	Executions per second
✓ cached Intl.DateTimeFormat.format()	860,373 Ops/sec
cached Intl.DateTimeFormat.formatToParts()	371,481 Ops/sec
new Intl.DateTimeFormat.formatToParts	29,007 Ops/sec
new Intl.DateTimeFormat.format()	28,492 Ops/sec
date methods	28,212 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: