Benchmark: Dayjs Date-fns format comparison 1

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 Preparation code:

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

Tests:

Date-fns
window.datefns.parseISO(window.ds); window.datefns.add(new Date(2014, 8, 1, 10, 19, 50), { years: 2, months: 9, weeks: 1, days: 7, hours: 5, minutes: 9, seconds: 30, });
Dayjs
dayjs(ds) dayjs(new Date(2014, 8, 1, 10, 19, 50)).add({ years: 2, months: 9, weeks: 1, days: 7, hours: 5, minutes: 9, seconds: 30, })

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Date-fns
Dayjs

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) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser/OS: Chrome 120 on Windows

View result in a separate tab

Test name	Executions per second
Date-fns	63521.7 Ops/sec
Dayjs	71379.0 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 the pros and cons of different approaches.

**Benchmark Overview**

The test measures the performance difference between using the `dayjs` library and the `datefns` library for date formatting and manipulation tasks. Specifically, it compares the execution speed of parsing an ISO-formatted string and adding a custom date interval to both libraries.

**Library Descriptions**

1. **Day.js**: Day.js is a lightweight JavaScript date library that provides a simple and easy-to-use API for working with dates. It's designed to be fast and efficient, making it suitable for use in high-performance applications.
2. **Date-fns**: Date-fns is another popular JavaScript date library that offers a wide range of features for manipulating dates, including formatting, parsing, and adding custom intervals.

**Test Case Analysis**

The test consists of two individual test cases:

1. **Date-fns Test Case**:
	* The benchmark definition code parses an ISO-formatted string using `window.datefns.parseISO(window.ds);`.
	* It then adds a custom date interval to the parsed date using `window.datefns.add(...)`.
	* This test case compares the performance of adding a custom date interval to Date-fns.
2. **Dayjs Test Case**:
	* The benchmark definition code uses Day.js to parse an ISO-formatted string and adds a custom date interval using `dayjs(ds).add({...})`.

**Comparison of Approaches**

The two libraries use different approaches to achieve their performance goals:

1. **Date-fns**: Date-fns is designed for ease of use and flexibility, which can come at the cost of performance. Its parsing algorithm might be less optimized compared to Day.js.
2. **Day.js**: Day.js is optimized for speed and efficiency, making it a better choice for high-performance applications.

**Pros and Cons**

* **Date-fns Pros**:
	+ Easier to use and more intuitive API
	+ Offers a wide range of features for date manipulation
	+ Can be more flexible and customizable
* **Date-fns Cons**:
	+ Might have slower performance compared to Day.js
	+ May require more code to achieve the same results
* **Day.js Pros**:
	+ Optimized for speed and efficiency
	+ Suitable for high-performance applications
	+ Can be a better choice when raw speed is critical
* **Day.js Cons**:
	+ Steeper learning curve due to its more minimalist API
	+ May lack some features available in Date-fns

**Special JS Features or Syntax**

None of the test cases explicitly use any special JavaScript features or syntax beyond standard ES6 features.

**Other Alternatives**

For date manipulation and formatting tasks, other alternatives to Day.js and Date-fns include:

1. **Moment.js**: A popular JavaScript library for working with dates, offering a wide range of features and a familiar API.
2. **Luxon**: A modern JavaScript library for working with dates and times, providing a robust set of features and a clean API.

Keep in mind that the choice of library ultimately depends on your specific project requirements, performance needs, and personal preference.

Related benchmarks:

Dayjs Date-fns format comparison 1 (version: 0)

Comparing performance of: Date-fns vs Dayjs

Created: 3 years ago by: Guest

Jump to the latest result

Date-fns

Dayjs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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