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/127.0.0.0 Safari/537.36

Browser: Chrome 127

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

cached Intl.DateTimeFormat.format()

809K/s

cached Intl.DateTimeFormat.formatToParts()

354K/s

date methods

32K/s

new Intl.DateTimeFormat.formatToParts

30K/s

new Intl.DateTimeFormat.format()

29K/s

View exact numbers

Test name	Executions per second
✓ cached Intl.DateTimeFormat.format()	808,986 Ops/sec
cached Intl.DateTimeFormat.formatToParts()	353,633 Ops/sec
date methods	31,579 Ops/sec
new Intl.DateTimeFormat.formatToParts	29,835 Ops/sec
new Intl.DateTimeFormat.format()	29,273 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: