Benchmark: Date vs Dayjs - MeasureThat.net

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/dayjs@1/dayjs.min.js"></script>

Tests:

Date
new Date('2000-01-01' + 'T00:00')
dayjs
dayjs('2000-01-01', { utc: true }).toDate()

Historical Performance Data aggregated from 10 community runs

Desktop Results:

Chrome 10 runs

Date

5.1M/s

dayjs

2.2M/s

Fastest: Date (2.3x faster)

View exact numbers

✓ Date: 5,137,886 ops/sec
• dayjs: 2,236,476 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
dayjs

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser/OS: Chrome 135 on Windows

View result in a separate tab

Date

2.7M/s

dayjs

1.6M/s

View exact numbers

Test name	Executions per second
✓ Date	2,740,129 Ops/sec
dayjs	1,643,986 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's being tested.

**Benchmark Definition**

The benchmark definition provides two JavaScript expressions that are being compared:

1. `new Date('2000-01-01' + 'T00:00')`
2. `dayjs('2000-01-01', { utc: true }).toDate()`

These expressions are comparing the performance of creating a new `Date` object versus using the `dayjs` library to create a date and then converting it to a Date object.

**Options Compared**

The two options being compared are:

1. Creating a new `Date` object using the `new Date()` constructor.
2. Using the `dayjs` library to create a date and then converting it to a Date object using the `.toDate()` method.

**Pros and Cons of Each Approach**

**Creating a new `Date` object:**

Pros:

* Simple and straightforward way to create a date object.
* No external dependencies required.
* Native JavaScript implementation, which means it's built into the browser or Node.js environment.

Cons:

* May not be as efficient as using an external library like `dayjs`, especially for complex date calculations.
* Limited functionality compared to external libraries.

**Using `dayjs` library:**

Pros:

* Highly optimized and performant implementation of date calculations.
* Supports a wide range of date formats and calculations.
* Easy to use and integrate into existing codebases.

Cons:

* External dependency required, which may add extra overhead in terms of download size and complexity.
* May have additional features that are not needed for simple date calculations.

**Library: `dayjs`**

`dayjs` is a popular JavaScript library for working with dates. It provides a simple and intuitive API for performing various date-related tasks, such as formatting dates, calculating time differences, and handling daylight saving time (DST) adjustments. The `.toDate()` method is used to convert a dayjs object to a native Date object.

**Special JS Feature: None**

There are no special JavaScript features or syntax being tested in this benchmark.

**Other Alternatives**

If you need to create date objects frequently, other alternatives to `dayjs` include:

* `moment.js`: A popular and widely-used library for working with dates.
* `Luxon`: A modern and efficient library for handling dates and times.
* The native JavaScript `Date` object: As mentioned earlier, creating a new `Date` object using the `new Date()` constructor is another option.

In summary, this benchmark compares the performance of creating a new `Date` object versus using the `dayjs` library to create a date and then converting it to a Date object. The choice between these options depends on your specific use case and requirements, such as performance, complexity, and additional features needed.

Date vs Dayjs (version: 0)

Comparing performance of: `Date vs dayjs`

Created: 2 years ago by: Guest

Go to the latest result

Date

dayjs

Historical Performance Data aggregated from 10 community runs

Desktop Results:

Chrome 10 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Date vs Dayjs (version: 0)

Comparing performance of: Date vs dayjs

Created: 2 years ago by: Guest

Go to the latest result

Date

dayjs

Historical Performance Data aggregated from 10 community runs

Desktop Results:

Chrome 10 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 vs dayjs`