Benchmark: Get offset ms Date vs epochms

Tests:

Convert string to date using native Date.parse then get ms offset
const y = Date.parse("2022-10-20T03:24:21.127+0800") - Date.now();
Convert string epochms and get ms offset
const z = Number("1666207461127") - Date.now();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Convert string to date using native Date.parse then get ms offset
Convert string epochms and get ms offset

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/106.0.0.0 Safari/537.36

Browser/OS: Chrome 106 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Convert string to date using native Date.parse then get ms offset	3322053.2 Ops/sec
Convert string epochms and get ms offset	5001107.5 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what is being tested, compared, and the pros and cons of each approach.

**Benchmark Overview**

The test measures the performance of two different approaches for getting the milliseconds offset between a given date string or epoch milliseconds and the current timestamp using JavaScript.

**Options Compared**

There are two options being compared:

1. **Using `Date.parse()`**: This method converts a date string to its corresponding Unix timestamp, which is then subtracted from the current timestamp to get the milliseconds offset.
2. **Using `Number()`**: This method directly converts epoch milliseconds to the corresponding JavaScript number value.

**Pros and Cons of Each Approach**

1. **`Date.parse()`**:
	* Pros: More human-readable date strings can be parsed, and it's often a more straightforward approach for developers familiar with Date objects.
	* Cons: May be slower due to parsing the entire date string, and may throw errors if the input is invalid or in an unexpected format.
2. **`Number()`**:
	* Pros: Faster execution since it only converts the epoch milliseconds value without any additional processing, and more accurate for exact numerical conversions.
	* Cons: Requires careful handling of potential errors when parsing the epoch milliseconds string, and may not be as readable or intuitive for developers.

**Library Usage**

There is no explicit library usage mentioned in the provided benchmark. However, it's worth noting that `Date.parse()` uses the JavaScript built-in Date object, which relies on the browser's internal date calculations.

**Special JS Features/Syntax**

The test does not explicitly use any special JavaScript features or syntax, but it does rely on the `Number()` function to perform numerical conversions. Additionally, `Date.now()` is used to get the current timestamp, which is a built-in JavaScript method.

**Other Considerations**

When creating benchmarks like this, it's essential to consider factors such as:

* Input data quality: Are date strings or epoch milliseconds in the expected format? What about edge cases (e.g., invalid input)?
* Browser and platform variability: How do different browsers and platforms handle these approaches?
* Additional overheads: Are there any other operations (e.g., string processing, array creation) that might affect performance?

**Alternatives**

For similar benchmarks, consider comparing the performance of:

1. Using `new Date()` for date parsing
2. Using a dedicated library like Moment.js or Luxon for date handling and conversions
3. Implementing custom date parsing logic using regular expressions or other techniques

These alternatives may provide different trade-offs in terms of execution speed, readability, and maintainability, depending on the specific use case and requirements.

Related benchmarks:

Get offset ms Date vs epochms (version: 6)

Comparing performance of: Convert string to date using native Date.parse then get ms offset vs Convert string epochms and get ms offset

Created: 2 years ago by: Registered User

Jump to the latest result

Convert string to date using native Date.parse then get ms offset

Convert string epochms and get ms offset

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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