Benchmark: dayjs vs datefns (calculations)

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/dayjs/1.10.7/dayjs.min.js" integrity="sha512-bwD3VD/j6ypSSnyjuaURidZksoVx3L1RPvTkleC48SbHCZsemT3VKMD39KknPnH728LLXVMTisESIBOAb5/W0Q==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/date-fns/1.30.1/date_fns.min.js" referrerpolicy="no-referrer"></script>

Script Preparation code:

window.__date__ = new Date();
window.__dayjs__ = dayjs(__date__);

Tests:

datefns
dateFns.addYears(__date__, 2);
dayjs
__dayjs__.add(2, "year");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
datefns
dayjs

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

I'd be happy to help explain the provided benchmark.

**Benchmark Overview**

The benchmark compares the performance of two date calculation libraries: `dateFns` and `dayjs`. The test cases are designed to measure how long it takes for each library to perform specific calculations on a sample date.

**Options Compared**

The two options being compared are:

1. **dateFns**: A modern JavaScript library that provides functions for working with dates, including calculation methods like `addYears`.
2. **dayjs**: Another popular JavaScript library for date manipulation and calculation.

**Pros and Cons of Each Approach**

* **dateFns**:
	+ Pros: More flexible and customizable, supports a wide range of date calculations.
	+ Cons: May be slower than dayjs due to its more complex implementation.
* **dayjs**:
	+ Pros: Faster execution times, simpler and more concise API.
	+ Cons: Less flexible and less customizable than dateFns.

**Library Descriptions**

1. **dateFns**: A lightweight JavaScript library that provides a simple and consistent API for working with dates. Its `addYears` method adds years to a given date.
2. **dayjs**: A fast and efficient JavaScript library for date manipulation and calculation. It provides a concise API for common tasks, such as adding years to a date.

**Special JS Features/Syntax**

Neither of the tested libraries uses any special JavaScript features or syntax that would require an explanation.

**Other Alternatives**

If you're looking for alternative libraries for date calculations in JavaScript, some other options include:

* **moment.js**: A widely used library for working with dates and times.
* **Luxon**: A modern JavaScript library for dates and times, known for its high performance and ease of use.
* **Date-fn's own alternatives**: As part of the same project as dateFns, there are also some alternative libraries that can be used to replace dayjs.

**Benchmark Considerations**

When interpreting the benchmark results, consider the following factors:

* **Execution times**: The time it takes for each library to execute a specific test case. In this case, `dateFns` is slightly slower than `dayjs`.
* **Browser and device platform**: The benchmark was run on Opera 96 on a Windows desktop, which may affect the results.
* **Number of executions per second**: This metric indicates how many times each library can execute in one second. In this case, `dateFns` is faster.

Overall, the benchmark suggests that `dayjs` is currently faster than `dateFns` for simple date calculations like adding years to a date. However, the results may vary depending on specific use cases and requirements.

Related benchmarks:

dayjs vs datefns (calculations) (version: 0)

Comparing performance of: datefns vs dayjs

Created: 3 years ago by: Guest

Jump to the latest result

datefns

dayjs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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