Benchmark: Moment Dayjs Date-fns comparison

HTML Preparation code:

<script src="https://unpkg.com/dayjs@1.8.21/dayjs.min.js"></script>
<script src="https://igor.moomers.org/random/datefns.js"></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.22.0/moment.min.js'></script>

Script Preparation code:

window.ds = "2020-02-19T00:51:53.623839+00:00";

Tests:

Date-fns
window.datefns.parseISO(window.ds)
Moment
moment(ds)
Dayjs
dayjs(ds)

Historical Performance Data aggregated from 117 community runs

Desktop Results:

Chrome 94 runs

Date-fns

750K/s

Dayjs

550K/s

Moment

210K/s

Fastest: Date-fns (3.6x faster)

View exact numbers

✓ Date-fns: 750,134 ops/sec
• Dayjs: 550,198 ops/sec
• Moment: 210,337 ops/sec

Firefox 12 runs

Dayjs

488K/s

Date-fns

463K/s

Moment

117K/s

Fastest: Dayjs (4.2x faster)

View exact numbers

✓ Dayjs: 487,965 ops/sec
• Date-fns: 463,059 ops/sec
• Moment: 117,074 ops/sec

Mobile Results:

Chrome 11 runs

Date-fns

446K/s

Dayjs

402K/s

Moment

105K/s

Fastest: Date-fns (4.2x faster)

View exact numbers

✓ Date-fns: 446,118 ops/sec
• Dayjs: 401,595 ops/sec
• Moment: 105,122 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
Date-fns
Moment
Dayjs

Fastest: N/A

Slowest: N/A

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/138.0.0.0 Safari/537.36

Browser/OS: Chrome 138 on Mac OS X 10.15.7

View result in a separate tab

Date-fns

1.1M/s

Dayjs

647K/s

Moment

292K/s

View exact numbers

Test name	Executions per second
✓ Date-fns	1,111,693 Ops/sec
Dayjs	647,291 Ops/sec
Moment	291,862 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what is being tested, compared, and analyzed.

**Benchmark Purpose**

The benchmark measures the performance of three JavaScript libraries: Date-fns, Moment.js, and Dayjs. Specifically, it tests the parsing of a ISO-formatted date string using each library.

**Options Compared**

The three options being compared are:

1. **Date-fns**: A modern JavaScript library for working with dates and times.
2. **Moment.js**: A popular JavaScript library for date and time manipulation.
3. **Dayjs**: A lightweight, fast, and feature-rich alternative to Moment.js.

**Pros and Cons of Each Approach**

Here's a brief overview of the pros and cons of each approach:

1. **Date-fns**:
	* Pros: Fast, modern, and well-maintained. Offers a lot of features out of the box.
	* Cons: Can be overwhelming for beginners due to its feature-rich nature.
2. **Moment.js**:
	* Pros: Extremely popular and widely adopted, with a large community and plenty of resources available.
	* Cons: Can be slower than Date-fns due to its complexity and overhead.
3. **Dayjs**:
	* Pros: Fast, lightweight, and easy to use. Offers many features similar to Moment.js at a fraction of the size.
	* Cons: May lack some features or have a more limited set of options compared to Moment.js.

**Library Usage**

The benchmark uses the following libraries:

1. **Date-fns**: Used for parsing the ISO-formatted date string (`window.datefns.parseISO(window.ds)`).
2. **Moment.js**: Used for parsing the same date string (`moment(ds)`).
3. **Dayjs**: Also used for parsing the same date string (`dayjs(ds)`).

**Special JS Feature/Syntax**

None of the libraries in this benchmark use any special JavaScript features or syntax.

**Other Alternatives**

If you're looking for alternatives to these libraries, some options include:

1. **Luxon**: A modern and feature-rich library for working with dates and times.
2. **JSDateRef**: A lightweight alternative to Date-fns with a similar API.
3. **Moment-Timezone**: An extension of Moment.js that adds support for timezones.

Keep in mind that each library has its own strengths and weaknesses, and the choice ultimately depends on your specific needs and preferences.

Moment Dayjs Date-fns comparison (version: 0)

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

Created: 5 years ago by: Guest

Go to the latest result

Date-fns

Moment

Dayjs

Historical Performance Data aggregated from 117 community runs

Desktop Results:

Chrome 94 runs

Firefox 12 runs

Mobile Results:

Chrome 11 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Moment Dayjs Date-fns comparison (version: 0)

Comparing performance of: Date-fns vs Moment vs Dayjs

Created: 5 years ago by: Guest

Go to the latest result

Date-fns

Moment

Dayjs

Historical Performance Data aggregated from 117 community runs

Desktop Results:

Chrome 94 runs

Firefox 12 runs

Mobile Results:

Chrome 11 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: `Date-fns vs Moment vs Dayjs`