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

Script Preparation code:

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

Tests:

new Date()
(new Date()).toISOString().trim().replace('T', ' ').replace('Z', '')
Intl.DateTimeFormat()
dateTimeFormat.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

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:100.0) Gecko/20100101 Firefox/100.0

Browser/OS: Firefox 100 on Windows

View result in a separate tab

Test name	Executions per second
new Date()	1208835.0 Ops/sec
Intl.DateTimeFormat()	278692.0 Ops/sec
Date().toLocaleString()	6185.9 Ops/sec
JavaScript Date Time format	2060749.0 Ops/sec
JavaScript Date Time format using Template Strings.	1893144.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 2 months ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript benchmarks.

**Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks, comparing different approaches and libraries. The provided benchmark definition and test cases are used to measure the performance of various methods for formatting dates in JavaScript.

**Benchmark Definition: new Intl.DateTimeFormat vs new Date().toLocaleDateString() fixed**

The benchmark definition compares two approaches:

1. `new Intl.DateTimeFormat('en-US', options)` (Intl.DateTimeFormat)
2. `new Date().toLocaleDateString()` with some manual formatting adjustments (Date().toLocaleDateString())

The `options` object defines the formatting requirements, such as year, month, day, hour, minute, second, and fractional seconds.

**Options Comparison**

Both approaches use a similar format string to achieve the desired output. However, there are some differences:

* Intl.DateTimeFormat:
	+ Uses the Internationalization API (Intl) to handle date formatting.
	+ Supports more advanced formatting options, such as year, month, day, hour, minute, second, and fractional seconds.
	+ Can be customized with locale-specific settings.
* Date().toLocaleDateString():
	+ Uses the built-in `toLocaleDateString()` method to format dates.
	+ Provides a simpler, more straightforward way to format dates, but may not support all formatting options.

**Pros and Cons**

Internl.DateTimeFormat:

Pros:

* Supports advanced formatting options
* Can be customized with locale-specific settings

Cons:

* May require additional setup and configuration (e.g., Intl API)
* Can be slower due to the overhead of the Internationalization API

Date().toLocaleDateString():

Pros:

* Simple and straightforward
* Built-in method, no additional setup required

Cons:

* Limited formatting options
* May not support advanced formatting features

**Library: Intl.DateTimeFormat**

The Intl.DateTimeFormat library is part of the Internationalization API (Intl) in JavaScript. It provides a way to format dates and numbers according to the user's locale and preferences. The library supports various formatting options, including date and time formats.

In this benchmark, Intl.DateTimeFormat is used to compare its performance with Date().toLocaleDateString().

**Special JS Feature: Template Literals (Template Strings)**

One of the test cases uses template literals (Template Strings) to format dates:
```javascript
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()}\r\n`
```
Template literals provide a concise way to embed expressions inside string literals, using the backtick (`) character. This feature is supported in modern JavaScript engines.

**Other Alternatives**

In addition to Intl.DateTimeFormat and Date().toLocaleDateString(), there are other approaches to formatting dates in JavaScript:

1. `Date.prototype.toISOString()`: converts the date to a ISO 8601 formatted string.
2. `moment.js` library: provides a more advanced date formatting API, but requires additional setup and configuration.

These alternatives may offer different trade-offs between performance, simplicity, and feature set. The choice of approach depends on the specific requirements of your project.

Related benchmarks:

new Intl.DateTimeFormat vs new Date().toLocaleDateString() fixed (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

Autogenerated LLM Summary (model llama3.2:3b, generated 2 months ago):