Benchmark: Moment Dayjs Date-fns format benchmark

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.format(window.datefns.parseISO(window.ds), "yyyy-mm-dd")
Momentjs
moment(ds).format("YYYY-MM-DD")
Dayjs
dayjs(ds).format("YYYY-MM-DD")

Historical Performance Data aggregated from 35 community runs

Desktop Results:

Chrome 35 runs

Date-fns

263K/s

Dayjs

262K/s

Momentjs

142K/s

Fastest: Date-fns (1.8x faster)

View exact numbers

✓ Date-fns: 262,876 ops/sec
• Dayjs: 262,444 ops/sec
• Momentjs: 142,164 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
Momentjs
Dayjs

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_6_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/139.0.7258.76 Mobile/15E148 Safari/604.1

Browser/OS: Chrome Mobile iOS 139 on iOS 18.6.0

View result in a separate tab

Dayjs

574K/s

Date-fns

379K/s

Momentjs

234K/s

View exact numbers

Test name	Executions per second
✓ Dayjs	573,714 Ops/sec
Date-fns	378,768 Ops/sec
Momentjs	233,732 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 JSON and explain what's being tested.

**Overall Purpose:**
The website, MeasureThat.net, allows users to create and run JavaScript microbenchmarks to compare the performance of different date formatting libraries (Date-fns, Moment.js, and Day.js). The goal is to determine which library provides the best performance for a specific use case.

**Benchmark Definition JSON:**

* **Name:** "Moment Dayjs Date-fns format benchmark"
* **Description:** Not provided.
* **Script Preparation Code:** Sets up the `ds` variable with a sample ISO date string. This code is executed before each test.
* **Html Preparation Code:** Includes scripts from three libraries:
	+ dayjs (version 1.8.21)
	+ Date-fns
	+ Moment.js (version 2.22.0)

**Individual Test Cases:**

Each test case has a unique `Benchmark Definition` string that includes the following elements:

* A reference to one of the three libraries (Date-fns, Moment.js, or Day.js) as `window.datefns`
* The `parseISO` function from one of the libraries is called with the `ds` variable as an argument.
* The result of the parsing operation is then passed to a formatting function (`format`) that takes two arguments: the parsed value and a format string (in this case, "yyyy-mm-dd").

**Pros and Cons of Different Approaches:**

1. **Date-fns:**
	* Pros:
		+ Uses a simple and efficient API.
		+ Optimized for performance.
	* Cons:
		+ May not be as well-known or widely supported as other libraries.
2. **Moment.js:**
	* Pros:
		+ Widely used and well-established library.
		+ Provides a wide range of formatting options.
	* Cons:
		+ Can be slower than Date-fns due to its larger size and more complex implementation.
3. **Day.js:**
	* Pros:
		+ A lightweight alternative to Moment.js, making it faster and more suitable for smaller applications.
		+ Provides a simple and intuitive API.

**Library Descriptions:**

1. **Date-fns:** Date-fns is a small, fast, and modern JavaScript library for working with dates and times. It provides a simple and efficient API for parsing and formatting dates.
2. **Moment.js:** Moment.js is a widely used JavaScript library for working with dates and times. While it's powerful and flexible, its implementation can be slower than Date-fns due to its larger size.
3. **Day.js:** Day.js is a lightweight alternative to Moment.js that provides a simple and intuitive API for working with dates and times.

**Special Features:**

None mentioned in the provided benchmark JSON. If special features or syntax were used, they would require additional explanation.

**Other Alternatives:**

1. **Luxon:** Luxon is another popular JavaScript library for working with dates and times that's known for its performance and ease of use.
2. **JS Date:** JS Date is a lightweight JavaScript library that provides a simple API for working with dates and times.

Keep in mind that the choice of date formatting library ultimately depends on the specific requirements of your project, including factors like performance, feature set, and maintainability.

Moment Dayjs Date-fns format benchmark (version: 0)

Moment Dayjs Date-fns format benchmark

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

Created: 5 years ago by: Guest

Go to the latest result

Date-fns

Momentjs

Dayjs

Historical Performance Data aggregated from 35 community runs

Desktop Results:

Chrome 35 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 format benchmark (version: 0)

Moment Dayjs Date-fns format benchmark

Comparing performance of: Date-fns vs Momentjs vs Dayjs

Created: 5 years ago by: Guest

Go to the latest result

Date-fns

Momentjs

Dayjs

Historical Performance Data aggregated from 35 community runs

Desktop Results:

Chrome 35 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 Momentjs vs Dayjs`