Benchmark: moment vs date-fns (startofday)

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.1/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/date-fns/1.30.1/date_fns.min.js"></script>

Script Preparation code:

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

Tests:

moment
var actual = moment(__date__).startOf('day').toISOString(); console.assert(actual === __expected__);
date-fns
var actual = dateFns.startOfDay(__date__).toISOString(); console.assert(actual === __expected__);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
moment
date-fns

Fastest: N/A

Slowest: N/A

Autogenerated LLM Sumamry (model llama3.2:3b, generated 3 days ago):

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided JSON represents a JavaScript microbenchmark comparing two date manipulation libraries: Moment.js and Date-fns. The benchmark measures the performance of each library's `startOf` function, which returns the start of the day for a given date.

**Library Overview**

1. **Moment.js**: A popular JavaScript date library that provides a simple and intuitive API for manipulating dates. It is widely used in web applications.
2. **Date-fns**: A modern JavaScript date library that offers a more functional programming style and is designed to be faster and more efficient than Moment.js.

**Comparison of Options**

The two libraries have different approaches to calculating the start of the day:

1. **Moment.js**: Calculates the start of the day by subtracting the fractional part of the date from the date, effectively rounding down to the nearest whole number.
2. **Date-fns**: Uses a more efficient algorithm that calculates the start of the day by taking advantage of the fact that the day starts at 00:00.

**Pros and Cons**

1. **Moment.js**:
	* Pros: Simple and intuitive API, widely supported.
	* Cons: May be slower than Date-fns due to its more complex algorithm.
2. **Date-fns**:
	* Pros: Faster performance, more efficient algorithm.
	* Cons: Steeper learning curve due to functional programming style.

**Other Considerations**

1. **Caching**: Both libraries may benefit from caching the result of `startOf` to avoid redundant calculations.
2. **Browser Support**: Moment.js has better support for older browsers, while Date-fns is more modern and might not work in older browsers.

**Library-Specific Features**

The benchmark uses the `startOfDay` function from both libraries. This function takes a date object as input and returns the start of the day for that date. The exact implementation details are not shown in the JSON, but it's likely that both libraries use similar logic to achieve this result.

**Special JS Feature or Syntax**

There is no special JavaScript feature or syntax used in this benchmark. It only relies on standard JavaScript functions and data types.

**Other Alternatives**

If you're looking for alternative date manipulation libraries, some popular options include:

1. **Day.js**: A modern JavaScript date library that offers a simple and intuitive API.
2. **Luxon**: A powerful JavaScript date library that provides advanced features for working with dates and times.
3. **js-joda**: A JavaScript implementation of the Joda-Time library, which is widely used in Java applications.

Ultimately, the choice of date manipulation library depends on your specific needs and requirements. If you need a simple and intuitive API, Moment.js might be a good choice. However, if you're looking for faster performance and more advanced features, Date-fns or one of the alternative libraries might be a better fit.

Latest run results:

Run details: (Test run date: 10 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36

Browser/OS: Chrome 119 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
moment	201265.0 Ops/sec
date-fns	269638.5 Ops/sec

Related benchmarks:

moment vs date-fns (startofday) (version: 0)

It's not a deep validation; I'm just comparing ONE function that those two libraries have in common.

Comparing performance of: moment vs date-fns

Created: 10 months ago by: Guest

Jump to the latest result

moment

date-fns

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Sumamry (model llama3.2:3b, generated 3 days ago):