Run results for: DateTimeFormat vs toLocaleString

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

toLocaleString single

27K/s

DateTimeFormat single

26K/s

toLocaleString 100

269/s

DateTimeFormat 100

265/s

DateTimeFormat 10000

3/s

toLocaleString 10000

3/s

View exact numbers

Test name	Executions per second
✓ toLocaleString single	26,849 Ops/sec
DateTimeFormat single	26,270 Ops/sec
toLocaleString 100	269 Ops/sec
DateTimeFormat 100	265 Ops/sec
DateTimeFormat 10000	3 Ops/sec
toLocaleString 10000	3 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
new Intl.DateTimeFormat('de-DE', options).format(new Date())
toLocaleString single
new Date().toLocaleString('de-DE', options)
DateTimeFormat 100
[...Array(100)].forEach((_, i) => new Intl.DateTimeFormat('de-DE', options).format(new Date()))
toLocaleString 100
[...Array(100)].forEach((_, i) => new Date().toLocaleString('de-DE', options))
DateTimeFormat 10000
[...Array(10000)].forEach((_, i) => new Intl.DateTimeFormat('de-DE', options).format(new Date()))
toLocaleString 10000
[...Array(10000)].forEach((_, i) => new Date().toLocaleString('de-DE', options))