Benchmark: moment.js vs day.js

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.30.1/moment.min.js'></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/dayjs/1.11.13/dayjs.min.js'></script>

Script Preparation code:

var unix = 1724409214;

Tests:

momentjs
return moment(unix);
dayjs
return dayjs(unix);

Historical Performance Data aggregated from 44 community runs

Desktop Results:

Chrome 44 runs

dayjs

10.3M/s

momentjs

4.6M/s

Fastest: dayjs (2.2x faster)

View exact numbers

✓ dayjs: 10,302,474 ops/sec
• momentjs: 4,628,846 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
momentjs
dayjs

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 6 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.36 Edg/144.0.0.0

Browser/OS: Chrome 144 on Windows

View result in a separate tab

dayjs

19.1M/s

momentjs

6.0M/s

View exact numbers

Test name	Executions per second
✓ dayjs	19,127,720 Ops/sec
momentjs	6,014,872 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

**Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. A benchmark is a test designed to measure the performance of a specific piece of code or technology. In this case, we have two benchmarks: moment.js and dayjs, which are both date and time libraries.

**Library and Purpose**

Moment.js and dayjs are both popular libraries for working with dates and times in JavaScript. They provide a simple and intuitive API for performing various operations such as parsing dates, calculating durations, and formatting dates.

* Moment.js is a widely-used library that provides a comprehensive set of date and time functions.
* dayjs is a smaller, more lightweight alternative to moment.js, designed to be faster and more efficient.

**Options Compared**

In this benchmark, two options are being compared: moment.js and dayjs. The main difference between the two libraries is their approach to parsing dates.

Moment.js uses a traditional date parsing approach, where it parses the input string as a human-readable date and then converts it into a JavaScript Date object.
Dayjs, on the other hand, uses a more modern and efficient approach called "decimal arithmetic", which allows it to perform calculations directly on the decimal representation of the dates, without converting them to JavaScript Date objects.

**Pros and Cons**

Here are some pros and cons of each library:

Moment.js:
Pros:

* Wide range of features and functionality
* Well-established community and ecosystem
* Support for many date formats and locales

Cons:

* Can be slower than dayjs due to its traditional parsing approach
* May use more memory due to its comprehensive set of features

Dayjs:
Pros:

* Faster execution times due to its decimal arithmetic approach
* Smaller footprint, which can result in faster page loads
* More lightweight and efficient

Cons:

* Limited functionality compared to moment.js
* May not support as many date formats and locales

**Other Considerations**

When choosing between moment.js and dayjs, it's essential to consider the specific requirements of your project. If you need a wide range of features and functionality, moment.js might be a better choice. However, if you prioritize speed and efficiency, dayjs could be a better fit.

**Benchmark Result Explanation**

The latest benchmark result shows that dayjs outperforms moment.js in terms of execution speed. This is because dayjs uses its decimal arithmetic approach to parse dates more efficiently than moment.js' traditional parsing approach.

In the provided test case, dayjs executed at approximately 91.3% of the time it took moment.js to execute. However, it's essential to note that this result may vary depending on the specific input data and other factors.

**Alternatives**

If you're looking for alternative libraries to moment.js or dayjs, here are a few options:

* Lux: A lightweight and fast date library that provides a simple API for working with dates.
* Date-fns: A modern and efficient library that provides a wide range of date and time functions.
* js-joda: A Java-based library that provides a robust set of date and time functions, which can also be used in JavaScript.

These libraries offer different trade-offs between speed, functionality, and ease of use, so it's essential to evaluate them based on your specific needs.

moment.js vs day.js (version: 0)

Comparing performance of: `momentjs vs dayjs`

Created: one year ago by: Guest

Go to the latest result

momentjs

dayjs

Historical Performance Data aggregated from 44 community runs

Desktop Results:

Chrome 44 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.js vs day.js (version: 0)

Comparing performance of: momentjs vs dayjs

Created: one year ago by: Guest

Go to the latest result

momentjs

dayjs

Historical Performance Data aggregated from 44 community runs

Desktop Results:

Chrome 44 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: `momentjs vs dayjs`