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Date vs Dayjs (not casting to date)
(version: 1)
Comparing performance of:
Date vs dayjs
Created:
one year ago
by:
Guest
Go to the latest result
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 })
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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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 (Macintosh; Intel Mac OS X 10.15; rv:136.0) Gecko/20100101 Firefox/136.0
Browser/OS:
Firefox 136 on Mac OS X 10.15
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=591750" width="100%" height="500px"></iframe>
Date
27.2M/s
dayjs
4.3M/s
View exact numbers
Test name
Executions per second
✓
Date
27,244,694 Ops/sec
dayjs
4,295,226 Ops/sec
Autogenerated LLM Summary
(model
gpt-4o-mini
, generated one year ago):
The benchmark defined in the provided JSON compares the performance of two different methods for creating date objects in JavaScript: the built-in `Date` constructor and the `dayjs` library. Both methods are used to represent a date but do so with different implementations and features. ### Options Compared 1. **Built-in Date Constructor**: - **Test Definition**: `new Date('2000-01-01' + 'T00:00')` - **Test Name**: Date - This method calls the native JavaScript `Date` object and creates a new date representing January 1, 2000. The `T00:00` is appended to specify the time, which sets the time to midnight. 2. **Day.js Library**: - **Test Definition**: `dayjs('2000-01-01', { utc: true })` - **Test Name**: dayjs - This method uses the `dayjs` library, a lightweight JavaScript date library, to create the same date. The `{ utc: true }` option specifies that the date should be created in Coordinated Universal Time (UTC). ### Pros and Cons #### Built-in Date Constructor - **Pros**: - Performance: As seen in the benchmark results, the native `Date` constructor performs significantly better (around 27 million executions per second). - No additional dependencies: Using the built-in `Date` object means there's no need to include external libraries, leading to smaller bundle sizes. - **Cons**: - Complexity: Handling time zones and date manipulations can be complex and sometimes counterintuitive, as the `Date` object does not natively support all operations simply or elegantly. - Limited functionality: While the built-in `Date` object covers basic needs, more advanced operations (like formatting, relative dates, etc.) can be cumbersome. #### Day.js Library - **Pros**: - Simplicity and readability: Day.js allows for easier manipulation and formatting of dates, often leading to more concise and understandable code. - Extended functionality: The library offers an extensive range of features, including parsing, manipulating, and displaying dates in different formats and time zones. - **Cons**: - Performance: The results indicate that Day.js is significantly slower (around 4.3 million executions per second) when compared to the built-in `Date`. - Dependency overhead: Including Day.js increases the size of your application and introduces external dependencies that need to be managed, which can affect loading times and might introduce compatibility issues. ### Other Considerations Using the `Date` object can be a better choice for performance-critical applications due to its speed and lack of dependencies. However, for applications that rely heavily on date manipulation, a library like Day.js (or alternatives like Moment.js, Luxon, or date-fns) can enable cleaner code and more intuitive date handling. ### Alternatives - **Moment.js**: A well-established library with comprehensive date manipulation capabilities but with a larger bundle size and slower performance compared to more modern libraries. - **date-fns**: Offers a modular approach to date functions, allowing developers to import only what they need, reducing bundle size. - **Luxon**: Built on the Internationalization API, it provides immutable date/time handling and supports advanced time zone operations. In conclusion, the choice between using the native `Date` object and a library like Day.js depends on the specific needs of the application, including considerations around performance, functionality, and code maintainability.
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