Benchmark: test date offset

Tests:

multiply
const dateFromString = new Date('2021-11-10T09:52:35.753'); const modifiedTime = dateFromString.getTime() + dateFromString.getTimezoneOffset() * 60 * 1000 * -1; console.log(modifiedTime);
utc date
const dateUTC = new Date('2021-11-10T09:52:35.753'); const date = new Date( Date.UTC( dateUTC.getFullYear(), dateUTC.getMonth(), dateUTC.getDate(), dateUTC.getHours(), dateUTC.getMinutes(), dateUTC.getSeconds() ) ); console.log(date);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
multiply
utc date

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 9 months ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36

Browser/OS: Chrome 139 on Linux

View result in a separate tab

Test name	Executions per second
multiply	5200.7 Ops/sec
utc date	2568.8 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 JSON data and explain what is being tested.

The provided JSON represents two benchmark test cases:

1. `multiply`: This test case measures the performance of creating a modified date object by adding the timezone offset to a given date string. The script preparation code is not provided, but it's likely that the benchmarker creates a date string using JavaScript's built-in `Date` constructor.
2. `utc date`: This test case measures the performance of creating a UTC date object from an existing date object using `Date.UTC`. Again, the script preparation code is not provided.

Now, let's discuss the options being compared:

**Option 1: Using `new Date('...')` with timezone offset**

This option uses the `Date` constructor to create a new date object, and then adds the timezone offset to it. This approach requires calculating the timezone offset manually.

Pros:

* Easy to implement
* Works for most use cases

Cons:

* Can be inaccurate due to rounding errors or differences in timezone calculations between browsers
* May not work correctly for dates outside of the standard timezone range (e.g., -11 hours)

**Option 2: Using `Date.UTC`**

This option uses the `Date.UTC` method to create a new UTC date object from an existing date object. This approach is more accurate than manually calculating the timezone offset.

Pros:

* More accurate than manual calculations
* Works correctly for dates outside of the standard timezone range

Cons:

* Requires additional libraries or polyfills (not included in the benchmark)
* May not work correctly for all use cases due to differences in timezone calculations between browsers

**Other considerations:**

* **Library usage**: The `Date` constructor and `Date.UTC` method rely on JavaScript's built-in timezone library, which is not explicitly mentioned. However, it's likely that the benchmarker assumes a default timezone configuration.
* **Special JS features/syntax**: There are no special JavaScript features or syntax used in these benchmark test cases. They only use standard JavaScript constructs.

Now, let's discuss other alternatives:

* **Other timezone libraries**: Instead of using the built-in `Date` constructor and `Date.UTC`, the benchmarker could use external timezone libraries like Moment.js or Luxon to create date objects.
* **Polyfills**: If the benchmarker wants to ensure accurate results across all browsers, they could include polyfills for the built-in `Date` constructor and `Date.UTC` method.

Keep in mind that these alternatives may add complexity to the benchmark test cases, so it's essential to carefully evaluate their impact on performance.

Related benchmarks:

test date offset (version: 0)

Comparing performance of: multiply vs utc date

Created: 4 years ago by: Guest

Jump to the latest result

multiply

utc date

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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