Benchmark: Intl.DateTimeFormat vs Date().toLocaleString()

Script Preparation code:

var options = {
  year: 'numeric', month: 'numeric', day: 'numeric',
  hour: 'numeric', minute: 'numeric', second: 'numeric',
  hour12: false,
  fractionalSecondDigits: 3,
}

Tests:

Date().toLocaleString
new Date().toLocaleString("en-US", options)
Intl.DateTimeFormat
new Intl.DateTimeFormat('en-US', options).format(new Date())

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Date().toLocaleString
Intl.DateTimeFormat

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 (iPhone; CPU iPhone OS 16_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.1 Mobile/15E148 Safari/604.1

Browser/OS: Mobile Safari 16 on iOS 16.1

View result in a separate tab

Test name	Executions per second
Date().toLocaleString	7009.6 Ops/sec
Intl.DateTimeFormat	7279.7 Ops/sec

Intl.DateTimeFormat vs Date().toLocaleString() (version: 0)

Comparing performance of: Date().toLocaleString vs Intl.DateTimeFormat

Created: one year ago by: Registered User

Jump to the latest result

Date().toLocaleString

Intl.DateTimeFormat

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A