Benchmark: Intl.DateTimeFormat (optimized) vs new Date().toLocaleDateString()

Script Preparation code:

var options = {
  year: 'numeric', month: 'numeric', day: 'numeric',
  hour: 'numeric', minute: 'numeric', second: 'numeric',
  hour12: false,
  fractionalSecondDigits: 3,
}
var intlFormat = new Intl.DateTimeFormat('en-US', options);

Tests:

new Date()
(new Date()).toISOString().trim().replace('T', ' ').replace('Z', '')
Intl.DateTimeFormat()
intlFormat.format(new Date())
Date().toLocaleString()
new Date().toLocaleString("en-US", options)
JavaScript Date Time format
let date_time = new Date() let formatted_date = date_time.getFullYear() + "-" + (date_time.getMonth() + 1) + "-" + date_time.getDate() + " " + date_time.getHours() + ":" + date_time.getMinutes() + ":" + date_time.getSeconds() + "." + date_time.getMilliseconds()
JavaScript Date Time format using Template Strings.
let date_time = new Date() let formatted_date = `${date_time.getFullYear()}-${date_time.getMonth() + 1}-${date_time.getDate()} ${date_time.getHours()}:${date_time.getMinutes()}:${date_time.getSeconds()}.${date_time.getMilliseconds()}`

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
new Date()
Intl.DateTimeFormat()
Date().toLocaleString()
JavaScript Date Time format
JavaScript Date Time format using Template Strings.

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36

Browser/OS: Chrome 111 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
new Date()	872349.1 Ops/sec
Intl.DateTimeFormat()	335947.5 Ops/sec
Date().toLocaleString()	8367.1 Ops/sec
JavaScript Date Time format	2485229.0 Ops/sec
JavaScript Date Time format using Template Strings.	2638668.0 Ops/sec

Intl.DateTimeFormat (optimized) vs new Date().toLocaleDateString() (version: 0)

Comparing performance of: new Date() vs Intl.DateTimeFormat() vs Date().toLocaleString() vs JavaScript Date Time format vs JavaScript Date Time format using Template Strings.

Created: 2 years ago by: Guest

Jump to the latest result

new Date()

Intl.DateTimeFormat()

Date().toLocaleString()

JavaScript Date Time format

JavaScript Date Time format using Template Strings.

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A