Run results for: DateTimeFormat vs toLocaleString 3

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
DateTimeFormat single	25287.7 Ops/sec
toLocaleString single	26001.1 Ops/sec
DateTimeFormat 100	8142.2 Ops/sec
toLocaleString 100	273.1 Ops/sec
DateTimeFormat 10000	116.4 Ops/sec
toLocaleString 10000	2.6 Ops/sec
DateTimeFormat 4	23595.8 Ops/sec
toLocaleString 4	6589.9 Ops/sec

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

/*your preparation JavaScript code goes here */
var options = {
  year: 'numeric', month: 'numeric', day: 'numeric',
  hour: 'numeric', minute: 'numeric', second: 'numeric',
  hour12: false,
  fractionalSecondDigits: 3,
}

Tests:

DateTimeFormat single
var formatter = new Intl.DateTimeFormat('de-DE', options); formatter.format(new Date());
toLocaleString single
new Date().toLocaleString('de-DE', options);
DateTimeFormat 100
var formatter = new Intl.DateTimeFormat('de-DE', options); [...Array(100)].forEach((_, i) => formatter.format(new Date()));
toLocaleString 100
[...Array(100)].forEach((_, i) => new Date().toLocaleString('de-DE', options));
DateTimeFormat 10000
var formatter = new Intl.DateTimeFormat('de-DE', options); [...Array(10000)].forEach((_, i) => formatter.format(new Date()));
toLocaleString 10000
[...Array(10000)].forEach((_, i) => new Date().toLocaleString('de-DE', options));
DateTimeFormat 4
var formatter = new Intl.DateTimeFormat('de-DE', options); [...Array(4)].forEach((_, i) => formatter.format(new Date()));
toLocaleString 4
[...Array(4)].forEach((_, i) => new Date().toLocaleString('de-DE', options));

Run results for: DateTimeFormat vs toLocaleString 3

DateTimeFormat single

toLocaleString single

DateTimeFormat 100

toLocaleString 100

DateTimeFormat 10000

toLocaleString 10000

DateTimeFormat 4

toLocaleString 4