Benchmark: Modern Date Libraries

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/date-fns/2.0.0-alpha0/date_fns.min.js" integrity="sha512-0kon+2zxkK5yhflwFqaTaIhLVDKGVH0YH/jm8P8Bab/4EOgC/n7gWyy7WE4EXrfPOVDeNdaebiAng0nsfeFd9A==" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/luxon@1.25.0/build/global/luxon.min.js"></script>
<script src="https://unpkg.com/dayjs@1.8.21/dayjs.min.js"></script>

Script Preparation code:

window.__date__ = new Date();
window.__expected__ = '2000/01/06';

Tests:

Luxon
var actual = luxon.DateTime.fromJSDate(__date__).toFormat('yyyy/MM/dd'); console.assert(actual === __expected__);
Date-fns
var actual = dateFns.format(__date__, 'YYYY/MM/DD'); console.assert(actual === __expected__);
Dayjs
var actual = dayjs(__date__).format('YYYY/MM/DD'); console.assert(actual === __expected__);

Historical Performance Data aggregated from 6 community runs

Desktop Results:

Chrome 6 runs

Date-fns

165K/s

Luxon

158K/s

Dayjs

119K/s

Fastest: Date-fns (1.4x faster)

View exact numbers

✓ Date-fns: 164,659 ops/sec
• Luxon: 157,934 ops/sec
• Dayjs: 119,023 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Luxon
Date-fns
Dayjs

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36

Browser/OS: Chrome 138 on Windows

View result in a separate tab

Date-fns

261K/s

Luxon

215K/s

Dayjs

108K/s

View exact numbers

Test name	Executions per second
✓ Date-fns	261,287 Ops/sec
Luxon	215,278 Ops/sec
Dayjs	108,115 Ops/sec

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

LLMs can make mistakes. Check important info.

Measuring JavaScript performance is crucial for modern web development. MeasurThat.net provides an excellent platform to compare the performance of various date and time libraries.

**What's being tested?**

In this benchmark, three popular JavaScript libraries are compared:

1. **Date-fns**: A lightweight and versatile library for date and time manipulation.
2. **Luxon**: A modern and powerful library developed by the same team behind Moment.js (although it's not a direct replacement).
3. **Dayjs**: A fast and flexible alternative to Date.js.

The benchmark focuses on converting a JavaScript `Date` object to a string representation in the format "YYYY/MM/DD" using each library.

**Options compared**

Each library offers different approaches to achieve this conversion:

1. **Date-fns**: Uses its `format()` function, which takes an options object and returns the formatted date string.
2. **Luxon**: Utilizes its `DateTime` class, specifically the `toFormat()` method, which formats a `DateTime` object as a string.
3. **Dayjs**: Employs its `format()` function, similar to Date-fns.

**Pros and cons of each approach**

1. **Date-fns**:
	* Pros: Lightweight ( around 10KB gzipped), simple API, fast performance.
	* Cons: Limited features compared to other libraries.
2. **Luxon**:
	* Pros: Feature-rich, modern architecture, excellent support for internationalization and time zones.
	* Cons: Heavier than Date-fns (~30KB gzipped) due to its more comprehensive feature set.
3. **Dayjs**:
	* Pros: Extremely lightweight (around 2KB gzipped), fast performance, simple API.
	* Cons: Limited features compared to Luxon and Date-fns.

**Library libraries**

1. **Date-fns**: A small, modular library designed for date and time manipulation. It provides an extensive set of functions for various tasks, such as formatting dates, calculating durations, and handling time zones.
2. **Luxon**: Developed by the same team behind Moment.js, Luxon is a modern alternative to traditional date libraries. It offers advanced features like support for internationalization, time zones, and precision arithmetic.

**Special JS features or syntax**

None are explicitly mentioned in this benchmark.

**Other alternatives**

If you're considering alternative JavaScript date and time libraries, some notable options include:

1. **Moment.js**: A widely used library with a comprehensive set of features.
2. **Date.js**: An older but still maintained library, often considered as an alternative to Date-fns.
3. **Moment-Time-Zone (MTZ)**: An extension of Moment.js for handling time zones.

When choosing a JavaScript date and time library, consider factors such as performance, feature set, internationalization support, and ease of use for your specific project needs.

Modern Date Libraries (version: 0)

Comparing performance of: `Luxon vs Date-fns vs Dayjs`

Created: 5 years ago by: Guest

Go to the latest result

Luxon

Date-fns

Dayjs

Historical Performance Data aggregated from 6 community runs

Desktop Results:

Chrome 6 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Modern Date Libraries (version: 0)

Comparing performance of: Luxon vs Date-fns vs Dayjs

Created: 5 years ago by: Guest

Go to the latest result

Luxon

Date-fns

Dayjs

Historical Performance Data aggregated from 6 community runs

Desktop Results:

Chrome 6 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

Comparing performance of: `Luxon vs Date-fns vs Dayjs`